diff --git a/Hadrons/Environment.cc b/Hadrons/Environment.cc
index ab5b4de9..d184ac0b 100644
--- a/Hadrons/Environment.cc
+++ b/Hadrons/Environment.cc
@@ -45,19 +45,13 @@ Environment::Environment(void)
 {
     dim_         = GridDefaultLatt();
     nd_          = dim_.size();
-    defaultGrid_ = {typeHash<vComplex>(), 1};
-    grid4d_[defaultGrid_].reset(
-        SpaceTimeGrid::makeFourDimGrid(dim_, 
-                                       GridDefaultSimd(nd_, vComplex::Nsimd()),
-                                       GridDefaultMpi()));
-    gridRb4d_[defaultGrid_].reset(
-        SpaceTimeGrid::makeFourDimRedBlackGrid(grid4d_[defaultGrid_].get()));
+    createGrid<vComplex>(1);
     vol_ = 1.;
     for (auto d: dim_)
     {
         vol_ *= d;
     }
-    rng4d_.reset(new GridParallelRNG(grid4d_[defaultGrid_].get()));
+    rng4d_.reset(new GridParallelRNG(getGrid()));
 }
 
 // grids ///////////////////////////////////////////////////////////////////////
diff --git a/Hadrons/Environment.hpp b/Hadrons/Environment.hpp
index 3cacd28b..8498cf81 100644
--- a/Hadrons/Environment.hpp
+++ b/Hadrons/Environment.hpp
@@ -174,7 +174,6 @@ private:
     bool                                protect_{true};
     // grids
     std::vector<int>                    dim_;
-    FineGridKey                         defaultGrid_;
     std::map<FineGridKey, GridPt>       grid4d_;
     std::map<FineGridKey, GridPt>       grid5d_;
     std::map<FineGridKey, GridRbPt>     gridRb4d_;
diff --git a/Hadrons/Global.hpp b/Hadrons/Global.hpp
index 61eb11c2..222990f6 100644
--- a/Hadrons/Global.hpp
+++ b/Hadrons/Global.hpp
@@ -96,19 +96,20 @@ using Grid::operator>>;
 BEGIN_HADRONS_NAMESPACE
 
 // type aliases
-#define FERM_TYPE_ALIASES(FImpl, suffix)\
-typedef FermionOperator<FImpl>                        FMat##suffix;            \
-typedef typename FImpl::FermionField                  FermionField##suffix;    \
-typedef typename FImpl::PropagatorField               PropagatorField##suffix; \
-typedef typename FImpl::SitePropagator::scalar_object SitePropagator##suffix;  \
-typedef std::vector<SitePropagator##suffix>           SlicedPropagator##suffix;
+#define BASIC_TYPE_ALIASES(Impl, suffix)\
+typedef typename Impl::Field                         ScalarField##suffix;\
+typedef typename Impl::PropagatorField               PropagatorField##suffix;\
+typedef typename Impl::SitePropagator::scalar_object SitePropagator##suffix;\
+typedef std::vector<SitePropagator##suffix>          SlicedPropagator##suffix;
 
-#define GAUGE_TYPE_ALIASES(FImpl, suffix)\
+#define FERM_TYPE_ALIASES(FImpl, suffix)\
+BASIC_TYPE_ALIASES(FImpl, suffix);\
+typedef FermionOperator<FImpl>            FMat##suffix;\
+typedef typename FImpl::FermionField      FermionField##suffix;\
 typedef typename FImpl::DoubledGaugeField DoubledGaugeField##suffix;
 
-#define SCALAR_TYPE_ALIASES(SImpl, suffix)\
-typedef typename SImpl::Field ScalarField##suffix;\
-typedef typename SImpl::Field PropagatorField##suffix;
+#define GAUGE_TYPE_ALIASES(GImpl, suffix)\
+typedef typename GImpl::GaugeField GaugeField##suffix;
 
 #define SOLVER_TYPE_ALIASES(FImpl, suffix)\
 typedef Solver<FImpl> Solver##suffix;
@@ -117,10 +118,6 @@ typedef Solver<FImpl> Solver##suffix;
 typedef std::function<SlicedPropagator##suffix\
                       (const PropagatorField##suffix &)> SinkFn##suffix;
 
-#define FG_TYPE_ALIASES(FImpl, suffix)\
-FERM_TYPE_ALIASES(FImpl, suffix)\
-GAUGE_TYPE_ALIASES(FImpl, suffix)
-
 // logger
 class HadronsLogger: public Logger
 {
diff --git a/Hadrons/Module.hpp b/Hadrons/Module.hpp
index f16c38e8..e9c1c449 100644
--- a/Hadrons/Module.hpp
+++ b/Hadrons/Module.hpp
@@ -67,6 +67,12 @@ MODULE_REGISTER(mod, ARG(base), ns);
 #define ARG(...) __VA_ARGS__
 #define MACRO_REDIRECT(arg1, arg2, arg3, macro, ...) macro
 
+#define envCreateGrid(latticeType, Ls)\
+env().template createGrid<typename latticeType::vector_type>(Ls)
+
+#define envGetGrid(latticeType, Ls)\
+env().template getGrid<typename latticeType::vector_type>(Ls)
+
 #define envGet(type, name)\
 *env().template getObject<type>(name)
 
@@ -86,10 +92,10 @@ env().template createObject<type>(name, Environment::Storage::object, Ls, __VA_A
 env().template createDerivedObject<base, type>(name, Environment::Storage::object, Ls, __VA_ARGS__)
 
 #define envCreateLat4(type, name)\
-envCreate(type, name, 1, env().getGrid())
+envCreate(type, name, 1, env().template getGrid<typename type::vector_type>())
 
 #define envCreateLat5(type, name, Ls)\
-envCreate(type, name, Ls, env().getGrid(Ls))
+envCreate(type, name, Ls, env().template getGrid<typename type::vector_type>(Ls))
 
 #define envCreateLat(...)\
 MACRO_REDIRECT(__VA_ARGS__, envCreateLat5, envCreateLat4)(__VA_ARGS__)
@@ -98,10 +104,10 @@ MACRO_REDIRECT(__VA_ARGS__, envCreateLat5, envCreateLat4)(__VA_ARGS__)
 env().template createObject<type>(name, Environment::Storage::cache, Ls, __VA_ARGS__)
 
 #define envCacheLat4(type, name)\
-envCache(type, name, 1, env().getGrid())
+envCache(type, name, 1, env().template getGrid<typename type::vector_type>())
 
 #define envCacheLat5(type, name, Ls)\
-envCache(type, name, Ls, env().getGrid(Ls))
+envCache(type, name, Ls, env().template getGrid<typename type::vector_type>(Ls))
 
 #define envCacheLat(...)\
 MACRO_REDIRECT(__VA_ARGS__, envCacheLat5, envCacheLat4)(__VA_ARGS__)
@@ -111,10 +117,10 @@ env().template createObject<type>(getName() + "_tmp_" + name,         \
                                   Environment::Storage::temporary, Ls, __VA_ARGS__)
 
 #define envTmpLat4(type, name)\
-envTmp(type, name, 1, env().getGrid())
+envTmp(type, name, 1, env().template getGrid<typename type::vector_type>())
 
 #define envTmpLat5(type, name, Ls)\
-envTmp(type, name, Ls, env().getGrid(Ls))
+envTmp(type, name, Ls, env().template getGrid<typename type::vector_type>(Ls))
 
 #define envTmpLat(...)\
 MACRO_REDIRECT(__VA_ARGS__, envTmpLat5, envTmpLat4)(__VA_ARGS__)
diff --git a/Hadrons/Modules/MAction/DWF.hpp b/Hadrons/Modules/MAction/DWF.hpp
index 88ceed75..714bccc3 100644
--- a/Hadrons/Modules/MAction/DWF.hpp
+++ b/Hadrons/Modules/MAction/DWF.hpp
@@ -56,7 +56,7 @@ template <typename FImpl>
 class TDWF: public Module<DWFPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TDWF(const std::string name);
diff --git a/Hadrons/Modules/MAction/MobiusDWF.hpp b/Hadrons/Modules/MAction/MobiusDWF.hpp
index 47e72ab8..4db2ebb6 100644
--- a/Hadrons/Modules/MAction/MobiusDWF.hpp
+++ b/Hadrons/Modules/MAction/MobiusDWF.hpp
@@ -56,7 +56,7 @@ template <typename FImpl>
 class TMobiusDWF: public Module<MobiusDWFPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TMobiusDWF(const std::string name);
diff --git a/Hadrons/Modules/MAction/ScaledDWF.hpp b/Hadrons/Modules/MAction/ScaledDWF.hpp
index f4f38810..850a8662 100644
--- a/Hadrons/Modules/MAction/ScaledDWF.hpp
+++ b/Hadrons/Modules/MAction/ScaledDWF.hpp
@@ -55,7 +55,7 @@ template <typename FImpl>
 class TScaledDWF: public Module<ScaledDWFPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TScaledDWF(const std::string name);
diff --git a/Hadrons/Modules/MAction/Wilson.hpp b/Hadrons/Modules/MAction/Wilson.hpp
index 6fbded7c..cccd648f 100644
--- a/Hadrons/Modules/MAction/Wilson.hpp
+++ b/Hadrons/Modules/MAction/Wilson.hpp
@@ -54,7 +54,7 @@ template <typename FImpl>
 class TWilson: public Module<WilsonPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TWilson(const std::string name);
diff --git a/Hadrons/Modules/MAction/WilsonClover.hpp b/Hadrons/Modules/MAction/WilsonClover.hpp
index 241bc6f9..48f4f44e 100644
--- a/Hadrons/Modules/MAction/WilsonClover.hpp
+++ b/Hadrons/Modules/MAction/WilsonClover.hpp
@@ -59,7 +59,7 @@ template <typename FImpl>
 class TWilsonClover: public Module<WilsonCloverPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TWilsonClover(const std::string name);
diff --git a/Hadrons/Modules/MAction/ZMobiusDWF.hpp b/Hadrons/Modules/MAction/ZMobiusDWF.hpp
index 13aaddd6..6a02a1ec 100644
--- a/Hadrons/Modules/MAction/ZMobiusDWF.hpp
+++ b/Hadrons/Modules/MAction/ZMobiusDWF.hpp
@@ -57,7 +57,7 @@ template <typename FImpl>
 class TZMobiusDWF: public Module<ZMobiusDWFPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TZMobiusDWF(const std::string name);
diff --git a/Hadrons/Modules/MContraction/Meson.hpp b/Hadrons/Modules/MContraction/Meson.hpp
index a5806d97..514a6bb9 100644
--- a/Hadrons/Modules/MContraction/Meson.hpp
+++ b/Hadrons/Modules/MContraction/Meson.hpp
@@ -77,7 +77,7 @@ class TMeson: public Module<MesonPar>
 public:
     FERM_TYPE_ALIASES(FImpl1, 1);
     FERM_TYPE_ALIASES(FImpl2, 2);
-    FERM_TYPE_ALIASES(ScalarImplCR, Scalar);
+    BASIC_TYPE_ALIASES(ScalarImplCR, Scalar);
     SINK_TYPE_ALIASES(Scalar);
     class Result: Serializable
     {
diff --git a/Hadrons/Modules/MFermion/FreeProp.hpp b/Hadrons/Modules/MFermion/FreeProp.hpp
index 000c2ea1..b5d7b1a3 100644
--- a/Hadrons/Modules/MFermion/FreeProp.hpp
+++ b/Hadrons/Modules/MFermion/FreeProp.hpp
@@ -56,7 +56,7 @@ template <typename FImpl>
 class TFreeProp: public Module<FreePropPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TFreeProp(const std::string name);
diff --git a/Hadrons/Modules/MFermion/GaugeProp.hpp b/Hadrons/Modules/MFermion/GaugeProp.hpp
index e6408a6d..e779ae68 100644
--- a/Hadrons/Modules/MFermion/GaugeProp.hpp
+++ b/Hadrons/Modules/MFermion/GaugeProp.hpp
@@ -56,7 +56,7 @@ template <typename FImpl>
 class TGaugeProp: public Module<GaugePropPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
     SOLVER_TYPE_ALIASES(FImpl,);
 public:
     // constructor
diff --git a/Hadrons/Modules/MGauge/Random.cc b/Hadrons/Modules/MGauge/Random.cc
index 2c5ae761..040cd91a 100644
--- a/Hadrons/Modules/MGauge/Random.cc
+++ b/Hadrons/Modules/MGauge/Random.cc
@@ -25,47 +25,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 See the full license in the file "LICENSE" in the top level distribution directory
 *************************************************************************************/
 /*  END LEGAL */
-
 #include <Hadrons/Modules/MGauge/Random.hpp>
 
 using namespace Grid;
 using namespace Hadrons;
 using namespace MGauge;
 
-/******************************************************************************
-*                           TRandom implementation                            *
-******************************************************************************/
-// constructor /////////////////////////////////////////////////////////////////
-TRandom::TRandom(const std::string name)
-: Module<NoPar>(name)
-{}
-
-// dependencies/products ///////////////////////////////////////////////////////
-std::vector<std::string> TRandom::getInput(void)
-{
-    std::vector<std::string> in;
-    
-    return in;
-}
-
-std::vector<std::string> TRandom::getOutput(void)
-{
-    std::vector<std::string> out = {getName()};
-    
-    return out;
-}
-
-// setup ///////////////////////////////////////////////////////////////////////
-void TRandom::setup(void)
-{
-    envCreateLat(LatticeGaugeField, getName());
-}
-
-// execution ///////////////////////////////////////////////////////////////////
-void TRandom::execute(void)
-{
-    LOG(Message) << "Generating random gauge configuration" << std::endl;
-    
-    auto &U = envGet(LatticeGaugeField, getName());
-    SU3::HotConfiguration(rng4d(), U);
-}
+template class Grid::Hadrons::MGauge::TRandom<GIMPL>;
diff --git a/Hadrons/Modules/MGauge/Random.hpp b/Hadrons/Modules/MGauge/Random.hpp
index 6a9c3592..84b8dba0 100644
--- a/Hadrons/Modules/MGauge/Random.hpp
+++ b/Hadrons/Modules/MGauge/Random.hpp
@@ -40,8 +40,11 @@ BEGIN_HADRONS_NAMESPACE
  ******************************************************************************/
 BEGIN_MODULE_NAMESPACE(MGauge)
 
+template <typename GImpl>
 class TRandom: public Module<NoPar>
 {
+public:
+    GAUGE_TYPE_ALIASES(GImpl,);
 public:
     // constructor
     TRandom(const std::string name);
@@ -57,7 +60,50 @@ protected:
     virtual void execute(void);
 };
 
-MODULE_REGISTER(Random, TRandom, MGauge);
+MODULE_REGISTER_TMP(Random, TRandom<GIMPL>, MGauge);
+
+/******************************************************************************
+*                           TRandom implementation                            *
+******************************************************************************/
+// constructor /////////////////////////////////////////////////////////////////
+template <typename GImpl>
+TRandom<GImpl>::TRandom(const std::string name)
+: Module<NoPar>(name)
+{}
+
+// dependencies/products ///////////////////////////////////////////////////////
+template <typename GImpl>
+std::vector<std::string> TRandom<GImpl>::getInput(void)
+{
+    std::vector<std::string> in;
+    
+    return in;
+}
+
+template <typename GImpl>
+std::vector<std::string> TRandom<GImpl>::getOutput(void)
+{
+    std::vector<std::string> out = {getName()};
+    
+    return out;
+}
+
+// setup ///////////////////////////////////////////////////////////////////////
+template <typename GImpl>
+void TRandom<GImpl>::setup(void)
+{
+    envCreateLat(GaugeField, getName());
+}
+
+// execution ///////////////////////////////////////////////////////////////////
+template <typename GImpl>
+void TRandom<GImpl>::execute(void)
+{
+    LOG(Message) << "Generating random gauge configuration" << std::endl;
+    
+    auto &U = envGet(GaugeField, getName());
+    GImpl::HotConfiguration(rng4d(), U);
+}
 
 END_MODULE_NAMESPACE
 
diff --git a/Hadrons/Modules/MGauge/StoutSmearing.hpp b/Hadrons/Modules/MGauge/StoutSmearing.hpp
index e859dde5..973ac38d 100644
--- a/Hadrons/Modules/MGauge/StoutSmearing.hpp
+++ b/Hadrons/Modules/MGauge/StoutSmearing.hpp
@@ -52,7 +52,7 @@ template <typename GImpl>
 class TStoutSmearing: public Module<StoutSmearingPar>
 {
 public:
-    typedef typename GImpl::Field GaugeField;
+    GAUGE_TYPE_ALIASES(GImpl,);
 public:
     // constructor
     TStoutSmearing(const std::string name);
diff --git a/Hadrons/Modules/MGauge/Unit.cc b/Hadrons/Modules/MGauge/Unit.cc
index f273a187..02ad7c0b 100644
--- a/Hadrons/Modules/MGauge/Unit.cc
+++ b/Hadrons/Modules/MGauge/Unit.cc
@@ -25,45 +25,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 See the full license in the file "LICENSE" in the top level distribution directory
 *************************************************************************************/
 /*  END LEGAL */
-
 #include <Hadrons/Modules/MGauge/Unit.hpp>
 
 using namespace Grid;
 using namespace Hadrons;
 using namespace MGauge;
 
-/******************************************************************************
-*                            TUnit implementation                             *
-******************************************************************************/
-// constructor /////////////////////////////////////////////////////////////////
-TUnit::TUnit(const std::string name)
-: Module<NoPar>(name)
-{}
-
-// dependencies/products ///////////////////////////////////////////////////////
-std::vector<std::string> TUnit::getInput(void)
-{
-    return std::vector<std::string>();
-}
-
-std::vector<std::string> TUnit::getOutput(void)
-{
-    std::vector<std::string> out = {getName()};
-    
-    return out;
-}
-
-// setup ///////////////////////////////////////////////////////////////////////
-void TUnit::setup(void)
-{
-    envCreateLat(LatticeGaugeField, getName());
-}
-
-// execution ///////////////////////////////////////////////////////////////////
-void TUnit::execute(void)
-{
-    LOG(Message) << "Creating unit gauge configuration" << std::endl;
-    
-    auto &U = envGet(LatticeGaugeField, getName());
-    SU3::ColdConfiguration(rng4d(), U);
-}
+template class Grid::Hadrons::MGauge::TUnit<GIMPL>;
diff --git a/Hadrons/Modules/MGauge/Unit.hpp b/Hadrons/Modules/MGauge/Unit.hpp
index f0af186f..f123f25b 100644
--- a/Hadrons/Modules/MGauge/Unit.hpp
+++ b/Hadrons/Modules/MGauge/Unit.hpp
@@ -40,8 +40,11 @@ BEGIN_HADRONS_NAMESPACE
  ******************************************************************************/
 BEGIN_MODULE_NAMESPACE(MGauge)
 
+template <typename GImpl>
 class TUnit: public Module<NoPar>
 {
+public:
+    GAUGE_TYPE_ALIASES(GImpl,);
 public:
     // constructor
     TUnit(const std::string name);
@@ -57,7 +60,48 @@ protected:
     virtual void execute(void);
 };
 
-MODULE_REGISTER(Unit, TUnit, MGauge);
+MODULE_REGISTER_TMP(Unit, TUnit<GIMPL>, MGauge);
+
+/******************************************************************************
+*                            TUnit implementation                             *
+******************************************************************************/
+// constructor /////////////////////////////////////////////////////////////////
+template <typename GImpl>
+TUnit<GImpl>::TUnit(const std::string name)
+: Module<NoPar>(name)
+{}
+
+// dependencies/products ///////////////////////////////////////////////////////
+template <typename GImpl>
+std::vector<std::string> TUnit<GImpl>::getInput(void)
+{
+    return std::vector<std::string>();
+}
+
+template <typename GImpl>
+std::vector<std::string> TUnit<GImpl>::getOutput(void)
+{
+    std::vector<std::string> out = {getName()};
+    
+    return out;
+}
+
+// setup ///////////////////////////////////////////////////////////////////////
+template <typename GImpl>
+void TUnit<GImpl>::setup(void)
+{
+    envCreateLat(GaugeField, getName());
+}
+
+// execution ///////////////////////////////////////////////////////////////////
+template <typename GImpl>
+void TUnit<GImpl>::execute(void)
+{
+    LOG(Message) << "Creating unit gauge configuration" << std::endl;
+    
+    auto &U = envGet(GaugeField, getName());
+    GImpl::ColdConfiguration(rng4d(), U);
+}
 
 END_MODULE_NAMESPACE
 
diff --git a/Hadrons/Modules/MIO/LoadNersc.cc b/Hadrons/Modules/MIO/LoadNersc.cc
index 6d26c2a8..ce7276f9 100644
--- a/Hadrons/Modules/MIO/LoadNersc.cc
+++ b/Hadrons/Modules/MIO/LoadNersc.cc
@@ -31,44 +31,4 @@ using namespace Grid;
 using namespace Hadrons;
 using namespace MIO;
 
-/******************************************************************************
-*                       TLoadNersc implementation                             *
-******************************************************************************/
-// constructor /////////////////////////////////////////////////////////////////
-TLoadNersc::TLoadNersc(const std::string name)
-: Module<LoadNerscPar>(name)
-{}
-
-// dependencies/products ///////////////////////////////////////////////////////
-std::vector<std::string> TLoadNersc::getInput(void)
-{
-    std::vector<std::string> in;
-    
-    return in;
-}
-
-std::vector<std::string> TLoadNersc::getOutput(void)
-{
-    std::vector<std::string> out = {getName()};
-    
-    return out;
-}
-
-// setup ///////////////////////////////////////////////////////////////////////
-void TLoadNersc::setup(void)
-{
-    envCreateLat(LatticeGaugeField, getName());
-}
-
-// execution ///////////////////////////////////////////////////////////////////
-void TLoadNersc::execute(void)
-{
-    FieldMetaData header;
-    std::string   fileName = par().file + "."
-                             + std::to_string(vm().getTrajectory());
-    LOG(Message) << "Loading NERSC configuration from file '" << fileName
-                 << "'" << std::endl;
-
-    auto &U = envGet(LatticeGaugeField, getName());
-    NerscIO::readConfiguration(U, header, fileName);
-}
+template class Grid::Hadrons::MIO::TLoadNersc<GIMPL>;
diff --git a/Hadrons/Modules/MIO/LoadNersc.hpp b/Hadrons/Modules/MIO/LoadNersc.hpp
index 231b2f47..c0e69511 100644
--- a/Hadrons/Modules/MIO/LoadNersc.hpp
+++ b/Hadrons/Modules/MIO/LoadNersc.hpp
@@ -46,8 +46,11 @@ public:
                                     std::string, file);
 };
 
+template <typename GImpl>
 class TLoadNersc: public Module<LoadNerscPar>
 {
+public:
+    GAUGE_TYPE_ALIASES(GImpl,);
 public:
     // constructor
     TLoadNersc(const std::string name);
@@ -62,7 +65,54 @@ public:
     virtual void execute(void);
 };
 
-MODULE_REGISTER(LoadNersc, TLoadNersc, MIO);
+MODULE_REGISTER_TMP(LoadNersc,  TLoadNersc<GIMPL>,  MIO);
+
+/******************************************************************************
+*                       TLoadNersc implementation                             *
+******************************************************************************/
+// constructor /////////////////////////////////////////////////////////////////
+template <typename GImpl>
+TLoadNersc<GImpl>::TLoadNersc(const std::string name)
+: Module<LoadNerscPar>(name)
+{}
+
+// dependencies/products ///////////////////////////////////////////////////////
+template <typename GImpl>
+std::vector<std::string> TLoadNersc<GImpl>::getInput(void)
+{
+    std::vector<std::string> in;
+    
+    return in;
+}
+
+template <typename GImpl>
+std::vector<std::string> TLoadNersc<GImpl>::getOutput(void)
+{
+    std::vector<std::string> out = {getName()};
+    
+    return out;
+}
+
+// setup ///////////////////////////////////////////////////////////////////////
+template <typename GImpl>
+void TLoadNersc<GImpl>::setup(void)
+{
+    envCreateLat(GaugeField, getName());
+}
+
+// execution ///////////////////////////////////////////////////////////////////
+template <typename GImpl>
+void TLoadNersc<GImpl>::execute(void)
+{
+    FieldMetaData header;
+    std::string   fileName = par().file + "."
+                             + std::to_string(vm().getTrajectory());
+    LOG(Message) << "Loading NERSC configuration from file '" << fileName
+                 << "'" << std::endl;
+
+    auto &U = envGet(GaugeField, getName());
+    NerscIO::readConfiguration(U, header, fileName);
+}
 
 END_MODULE_NAMESPACE
 
diff --git a/Hadrons/Modules/MScalar/ChargedProp.hpp b/Hadrons/Modules/MScalar/ChargedProp.hpp
index bf098cd1..443c38a6 100644
--- a/Hadrons/Modules/MScalar/ChargedProp.hpp
+++ b/Hadrons/Modules/MScalar/ChargedProp.hpp
@@ -55,7 +55,7 @@ public:
 class TChargedProp: public Module<ChargedPropPar>
 {
 public:
-    SCALAR_TYPE_ALIASES(SIMPL,);
+    BASIC_TYPE_ALIASES(SIMPL,);
     typedef PhotonR::GaugeField     EmField;
     typedef PhotonR::GaugeLinkField EmComp;
     class Result: Serializable
diff --git a/Hadrons/Modules/MScalar/FreeProp.hpp b/Hadrons/Modules/MScalar/FreeProp.hpp
index 25f5f709..5ed6756d 100644
--- a/Hadrons/Modules/MScalar/FreeProp.hpp
+++ b/Hadrons/Modules/MScalar/FreeProp.hpp
@@ -51,7 +51,7 @@ public:
 class TFreeProp: public Module<FreePropPar>
 {
 public:
-    SCALAR_TYPE_ALIASES(SIMPL,);
+    BASIC_TYPE_ALIASES(SIMPL,);
 public:
     // constructor
     TFreeProp(const std::string name);
diff --git a/Hadrons/Modules/MScalar/ScalarVP.hpp b/Hadrons/Modules/MScalar/ScalarVP.hpp
index b7b2431f..3cd01249 100644
--- a/Hadrons/Modules/MScalar/ScalarVP.hpp
+++ b/Hadrons/Modules/MScalar/ScalarVP.hpp
@@ -53,7 +53,7 @@ public:
 class TScalarVP: public Module<ScalarVPPar>
 {
 public:
-    SCALAR_TYPE_ALIASES(SIMPL,);
+    BASIC_TYPE_ALIASES(SIMPL,);
     typedef PhotonR::GaugeField     EmField;
     typedef PhotonR::GaugeLinkField EmComp;
     class Result: Serializable
diff --git a/Hadrons/Modules/MScalar/VPCounterTerms.hpp b/Hadrons/Modules/MScalar/VPCounterTerms.hpp
index e7335694..8bbc3e20 100644
--- a/Hadrons/Modules/MScalar/VPCounterTerms.hpp
+++ b/Hadrons/Modules/MScalar/VPCounterTerms.hpp
@@ -53,7 +53,7 @@ public:
 class TVPCounterTerms: public Module<VPCounterTermsPar>
 {
 public:
-    SCALAR_TYPE_ALIASES(SIMPL,);
+    BASIC_TYPE_ALIASES(SIMPL,);
     class Result: Serializable
     {
     public:
diff --git a/Hadrons/Modules/MSink/Point.hpp b/Hadrons/Modules/MSink/Point.hpp
index ea164ced..f7970346 100644
--- a/Hadrons/Modules/MSink/Point.hpp
+++ b/Hadrons/Modules/MSink/Point.hpp
@@ -53,7 +53,7 @@ template <typename FImpl>
 class TPoint: public Module<PointPar>
 {
 public:
-    FERM_TYPE_ALIASES(FImpl,);
+    BASIC_TYPE_ALIASES(FImpl,);
     SINK_TYPE_ALIASES();
 public:
     // constructor
diff --git a/Hadrons/Modules/MSolver/MixedPrecisionRBPrecCG.hpp b/Hadrons/Modules/MSolver/MixedPrecisionRBPrecCG.hpp
index 5ada4e69..5be1e3ce 100644
--- a/Hadrons/Modules/MSolver/MixedPrecisionRBPrecCG.hpp
+++ b/Hadrons/Modules/MSolver/MixedPrecisionRBPrecCG.hpp
@@ -58,8 +58,8 @@ template <typename FImplInner, typename FImplOuter, int nBasis>
 class TMixedPrecisionRBPrecCG: public Module<MixedPrecisionRBPrecCGPar>
 {
 public:
-    FG_TYPE_ALIASES(FImplInner, Inner);
-    FG_TYPE_ALIASES(FImplOuter, Outer);
+    FERM_TYPE_ALIASES(FImplInner, Inner);
+    FERM_TYPE_ALIASES(FImplOuter, Outer);
     SOLVER_TYPE_ALIASES(FImplOuter,);
     typedef HADRONS_DEFAULT_SCHUR_OP<FMatInner, FermionFieldInner> SchurFMatInner;
     typedef HADRONS_DEFAULT_SCHUR_OP<FMatOuter, FermionFieldOuter> SchurFMatOuter;
diff --git a/Hadrons/Modules/MSolver/RBPrecCG.hpp b/Hadrons/Modules/MSolver/RBPrecCG.hpp
index 09779b3a..8c83c6a1 100644
--- a/Hadrons/Modules/MSolver/RBPrecCG.hpp
+++ b/Hadrons/Modules/MSolver/RBPrecCG.hpp
@@ -58,7 +58,7 @@ template <typename FImpl, int nBasis>
 class TRBPrecCG: public Module<RBPrecCGPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
     SOLVER_TYPE_ALIASES(FImpl,);
 public:
     // constructor
diff --git a/Hadrons/Modules/MSource/Point.hpp b/Hadrons/Modules/MSource/Point.hpp
index 076a078d..082c04e8 100644
--- a/Hadrons/Modules/MSource/Point.hpp
+++ b/Hadrons/Modules/MSource/Point.hpp
@@ -63,7 +63,7 @@ template <typename FImpl>
 class TPoint: public Module<PointPar>
 {
 public:
-    FERM_TYPE_ALIASES(FImpl,);
+    BASIC_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TPoint(const std::string name);
diff --git a/Hadrons/Modules/MSource/SeqGamma.hpp b/Hadrons/Modules/MSource/SeqGamma.hpp
index 59776e80..59fdb7ae 100644
--- a/Hadrons/Modules/MSource/SeqGamma.hpp
+++ b/Hadrons/Modules/MSource/SeqGamma.hpp
@@ -71,7 +71,7 @@ template <typename FImpl>
 class TSeqGamma: public Module<SeqGammaPar>
 {
 public:
-    FG_TYPE_ALIASES(FImpl,);
+    FERM_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TSeqGamma(const std::string name);
@@ -125,7 +125,7 @@ template <typename FImpl>
 void TSeqGamma<FImpl>::setup(void)
 {
     envCreateLat(PropagatorField, getName());
-    envCacheLat(Lattice<iScalar<vInteger>>, tName_);
+    envCache(Lattice<iScalar<vInteger>>, tName_, 1, env().getGrid());
     envCacheLat(LatticeComplex, momphName_);
     envTmpLat(LatticeComplex, "coor");
 }
diff --git a/Hadrons/Modules/MSource/Z2.hpp b/Hadrons/Modules/MSource/Z2.hpp
index f2ca50be..ec57fbd4 100644
--- a/Hadrons/Modules/MSource/Z2.hpp
+++ b/Hadrons/Modules/MSource/Z2.hpp
@@ -66,7 +66,7 @@ template <typename FImpl>
 class TZ2: public Module<Z2Par>
 {
 public:
-    FERM_TYPE_ALIASES(FImpl,);
+    BASIC_TYPE_ALIASES(FImpl,);
 public:
     // constructor
     TZ2(const std::string name);
@@ -120,7 +120,7 @@ template <typename FImpl>
 void TZ2<FImpl>::setup(void)
 {
     envCreateLat(PropagatorField, getName());
-    envCacheLat(Lattice<iScalar<vInteger>>, tName_);
+    envCache(Lattice<iScalar<vInteger>>, tName_, 1, env().getGrid());
     envTmpLat(LatticeComplex, "eta");
 }
 
diff --git a/Hadrons/Modules/MUtilities/RandomVectors.hpp b/Hadrons/Modules/MUtilities/RandomVectors.hpp
index 570198d4..2444b850 100644
--- a/Hadrons/Modules/MUtilities/RandomVectors.hpp
+++ b/Hadrons/Modules/MUtilities/RandomVectors.hpp
@@ -96,8 +96,15 @@ std::vector<std::string> TRandomVectors<Field>::getOutput(void)
 template <typename Field>
 void TRandomVectors<Field>::setup(void)
 {
-    envCreate(std::vector<Field>, getName(), par().Ls, par().size, 
-              env().getGrid(par().Ls));
+    if (par().Ls > 1)
+    {
+        envCreate(std::vector<Field>, getName(), par().Ls, par().size, 
+                  env().getGrid(par().Ls));
+    }
+    else
+    {
+        envCreate(std::vector<Field>, getName(), 1, par().size, env().getGrid());
+    }
 }
 
 // execution ///////////////////////////////////////////////////////////////////