diff --git a/python/scripts/compile_servers.py b/python/scripts/compile_servers.py
index e3395a06f..88de03ce6 100644
--- a/python/scripts/compile_servers.py
+++ b/python/scripts/compile_servers.py
@@ -52,7 +52,7 @@ servers = [
 #     "eigerDetectorServer",
 #     "jungfrauDetectorServer",
       "mythen3DetectorServer",
-#     "gotthard2DetectorServer",
+      "gotthard2DetectorServer",
 #     "gotthardDetectorServer",
 #     "ctbDetectorServer",
 #     "moenchDetectorServer",
diff --git a/python/slsdet/enums.py b/python/slsdet/enums.py
index 98c16b14e..6c42c454b 100644
--- a/python/slsdet/enums.py
+++ b/python/slsdet/enums.py
@@ -14,4 +14,5 @@ clockIndex = _slsdet.slsDetectorDefs.clockIndex
 readoutMode = _slsdet.slsDetectorDefs.readoutMode
 masterFlags = _slsdet.slsDetectorDefs.masterFlags
 burstMode = _slsdet.slsDetectorDefs.burstMode
-timingSourceType = _slsdet.slsDetectorDefs.timingSourceType
\ No newline at end of file
+timingSourceType = _slsdet.slsDetectorDefs.timingSourceType
+M3_GainCaps = _slsdet.slsDetectorDefs.M3_GainCaps
\ No newline at end of file
diff --git a/python/src/detector.cpp b/python/src/detector.cpp
index 2ac8a2ce2..de5f0fcae 100644
--- a/python/src/detector.cpp
+++ b/python/src/detector.cpp
@@ -1140,6 +1140,9 @@ void init_det(py::module &m) {
              (Result<int>(Detector::*)(sls::Positions) const) &
                  Detector::getChipStatusRegister,
              py::arg() = Positions{})
+        .def("setGainCaps",
+             (void (Detector::*)(int, sls::Positions)) & Detector::setGainCaps,
+             py::arg(), py::arg() = Positions{})
         .def("getNumberOfAnalogSamples",
              (Result<int>(Detector::*)(sls::Positions) const) &
                  Detector::getNumberOfAnalogSamples,
diff --git a/python/src/enums.cpp b/python/src/enums.cpp
index 92391065d..00c4ea876 100644
--- a/python/src/enums.cpp
+++ b/python/src/enums.cpp
@@ -277,4 +277,13 @@ void init_enums(py::module &m) {
         .value("TIMING_EXTERNAL",
                slsDetectorDefs::timingSourceType::TIMING_EXTERNAL)
         .export_values();
+
+    py::enum_<slsDetectorDefs::M3_GainCaps>(Defs, "M3_GainCaps")
+        .value("CSR_C10pre", slsDetectorDefs::M3_GainCaps::CSR_C10pre)
+        .value("CSR_C15sh", slsDetectorDefs::M3_GainCaps::CSR_C15sh)
+        .value("CSR_C30sh", slsDetectorDefs::M3_GainCaps::CSR_C30sh)
+        .value("CSR_C50sh", slsDetectorDefs::M3_GainCaps::CSR_C50sh)
+        .value("CSR_C225ACsh", slsDetectorDefs::M3_GainCaps::CSR_C225ACsh)
+        .value("CSR_C15pre", slsDetectorDefs::M3_GainCaps::CSR_C15pre)
+        .export_values();
 }
diff --git a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer
index 347bb9f7c..fbae13647 100755
Binary files a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer and b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer differ
diff --git a/slsDetectorServers/mythen3DetectorServer/mythen3.c b/slsDetectorServers/mythen3DetectorServer/mythen3.c
index 3da3cd92d..04f4d5979 100644
--- a/slsDetectorServers/mythen3DetectorServer/mythen3.c
+++ b/slsDetectorServers/mythen3DetectorServer/mythen3.c
@@ -35,6 +35,32 @@ int getChipStatusRegister(){
   return chipStatusRegister;
 }
 
+// int setGainCaps(int caps){
+//   int csr = getChipStatusRegister();
+
+//   int gain_mask = 0;
+//   gain_mask |= 1 << CSR_C10pre;
+//   gain_mask |= 1 << CSR_C15sh;
+//   gain_mask |= 1 << CSR_C30sh;
+//   gain_mask |= 1 << CSR_C50sh;
+//   gain_mask |= 1 << CSR_C225ACsh;
+//   gain_mask |= 1 << CSR_C15pre;
+  
+//   LOG(logINFO, ("gain_mask: 0x%x\n", gain_mask));
+//   LOG(logINFO, ("csr: 0x%x\n", csr));
+//   csr &= ~gain_mask; //zero out the bits in the gain mask
+//   LOG(logINFO, ("csr: 0x%x\n", csr));
+//   caps &= gain_mask;
+//   csr |= caps;
+
+//   LOG(logINFO, ("csr: 0x%x\n", csr));
+
+//   //now comes the actual setting
+
+  
+//   return 0;
+// }
+
 patternParameters *setChipStatusRegister(int csr) {
   int iaddr=0;
   int  nbits=18;
diff --git a/slsDetectorServers/mythen3DetectorServer/mythen3.h b/slsDetectorServers/mythen3DetectorServer/mythen3.h
index 890fdd2c8..e2c7be76e 100644
--- a/slsDetectorServers/mythen3DetectorServer/mythen3.h
+++ b/slsDetectorServers/mythen3DetectorServer/mythen3.h
@@ -48,6 +48,9 @@
 
 #define CSR_default  (1<<CSR_C10pre )|(1<< CSR_C30sh)
 
+#define GAIN_MASK ((1 << CSR_C10pre) | ( 1 << CSR_C15sh) | (1 << CSR_C30sh) | (1 << CSR_C50sh) | (1 << CSR_C225ACsh) | ( 1 << CSR_C15pre))
+
+
 enum {Cp_0, Cp_10, Cp_15, Cp_45};
 enum {Csh_0,Csh_15,Csh_30,Csh_45,Csh_50,Csh_65,Csh_80,Csh_95};
 enum {Cac225, Cac_450};
@@ -58,6 +61,7 @@ enum {Cac225, Cac_450};
 int setBit(int ibit, int patword);
 int clearBit(int ibit, int patword);
 int getChipStatusRegister();
+
 patternParameters *setChipStatusRegister(int csr);
 patternParameters *setChannelRegisterChip(int ichip, int *mask, int *trimbits);
 patternParameters *setInterpolation(int mask);
diff --git a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
index cf9b21e66..fbe0044a9 100644
--- a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
@@ -2660,6 +2660,60 @@ int getNumberOfChips() { return NCHIP; }
 int getNumberOfDACs() { return NDAC; }
 int getNumberOfChannelsPerChip() { return NCHAN; }
 
+
+
+int setGainCaps(int caps){
+    //TODO Refactor!!!!!
+    int csr = getChipStatusRegister();
+    
+    LOG(logINFO, ("gain_mask: 0x%x\n", GAIN_MASK));
+    LOG(logINFO, ("csr: 0x%x\n", csr));
+    csr &= ~GAIN_MASK; //zero out the bits in the gain mask
+    LOG(logINFO, ("csr: 0x%x\n", csr));
+    caps &= GAIN_MASK;
+    csr |= caps;
+
+    LOG(logINFO, ("csr: 0x%x\n", csr));
+
+    //now comes the actual setting
+    // remember previous run clock
+    uint32_t prevRunClk = clkDivider[SYSTEM_C0];
+    patternParameters *pat=NULL;
+    int error=0;
+    // set to trimming clock
+    if (setClockDivider(SYSTEM_C0, DEFAULT_TRIMMING_RUN_CLKDIV) == FAIL) {
+        LOG(logERROR,
+            ("Could not start trimming. Could not set to trimming clock\n"));
+        return FAIL;
+    }
+    pat = setChipStatusRegister(csr);
+
+    if (pat) {  
+	    error|=loadPattern(pat);
+	if (error==0) 
+	  startPattern();
+	free(pat);
+      }	else
+	error=1;
+    /////////////////////////////////////////////////////////////////
+    if (error == 0) {
+    
+      LOG(logINFO, ("The gain has been changed\n"));
+    }
+    trimmingPrint = logINFO;
+    // set back to previous clock
+    if (setClockDivider(SYSTEM_C0, prevRunClk) == FAIL) {
+        LOG(logERROR, ("Could not set to previous run clock after trimming\n"));
+        return FAIL;
+    }
+
+    if (error != 0) {
+        return FAIL;
+    }
+    return OK;  
+}
+
+
 int setGain(int gain) {
     // remember previous run clock
     uint32_t prevRunClk = clkDivider[SYSTEM_C0];
diff --git a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
index 120738f8a..f80004224 100644
--- a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
+++ b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
@@ -357,6 +357,7 @@ enum timingMode getTiming();
 #ifdef MYTHEN3D
 void setInitialExtSignals();
 int isMaster();
+int setGainCaps(int caps);
 #endif
 #if defined(GOTTHARDD) || defined(MYTHEN3D)
 void setExtSignal(int signalIndex, enum externalSignalFlag mode);
diff --git a/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h b/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
index 4b57dec10..43f5295c8 100644
--- a/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
+++ b/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
@@ -247,4 +247,5 @@ int get_pattern(int);
 int load_default_pattern(int);
 int get_all_threshold_energy(int);
 int get_master(int);
-int get_csr();
\ No newline at end of file
+int get_csr();
+int set_gain_caps(int);
\ No newline at end of file
diff --git a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
index 93ca82604..2418567b9 100644
--- a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
+++ b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
@@ -370,6 +370,7 @@ void function_table() {
     flist[F_GET_ALL_THRESHOLD_ENERGY] = &get_all_threshold_energy;
     flist[F_GET_MASTER] = &get_master;
     flist[F_GET_CSR] = &get_csr;
+    flist[F_SET_GAIN_CAPS] = &set_gain_caps;
 
     // check
     if (NUM_DET_FUNCTIONS >= RECEIVER_ENUM_START) {
@@ -8405,3 +8406,38 @@ int get_csr(int file_des){
     return Server_SendResult(file_des, INT32, &retval, sizeof(retval));
 }
 
+int set_gain_caps(int file_des){
+    ret = OK;
+    memset(mess, 0, sizeof(mess));
+    int arg = 0;
+
+    if (receiveData(file_des, &arg, sizeof(arg), INT32) < 0)
+        return printSocketReadError();
+    LOG(logINFO, ("Setting gain caps to: %u\n", arg));
+
+    int retval = -1;
+
+#ifndef MYTHEN3D
+    functionNotImplemented();
+#else
+    // only set
+    
+    if (Server_VerifyLock() == OK) {
+        // if (arg != 0 && arg != 1) {
+        //     ret = FAIL;
+        //     sprintf(mess,
+        //             "Could not set gain caps. Invalid value %d. "
+        //             "Options [0-1]\n",
+        //             arg);
+        //     LOG(logERROR, (mess));
+        // } else {
+            setGainCaps(arg);
+            retval = getChipStatusRegister(); //TODO! fix 
+            LOG(logDEBUG1, ("gain caps retval: %u\n", retval));
+            // validate(arg, retval, " cds gain enable", DEC);
+        // }
+    }
+#endif
+    // return Server_SendResult(file_des, INT32, NULL, 0);
+    return Server_SendResult(file_des, INT32, &retval, sizeof(retval));
+}
diff --git a/slsDetectorSoftware/include/sls/Detector.h b/slsDetectorSoftware/include/sls/Detector.h
index 7c24ff055..8f2ad55f9 100644
--- a/slsDetectorSoftware/include/sls/Detector.h
+++ b/slsDetectorSoftware/include/sls/Detector.h
@@ -1312,6 +1312,8 @@ class Detector {
     //TODO! check if we really want to expose this !!!!!
     Result<int> getChipStatusRegister(Positions pos = {}) const;
 
+    void setGainCaps(int caps, Positions pos = {});
+
     ///@{
 
     /** @name CTB / Moench Specific */
diff --git a/slsDetectorSoftware/src/Detector.cpp b/slsDetectorSoftware/src/Detector.cpp
index f09056444..ab2d44f84 100644
--- a/slsDetectorSoftware/src/Detector.cpp
+++ b/slsDetectorSoftware/src/Detector.cpp
@@ -1619,6 +1619,10 @@ Result<int> Detector::getChipStatusRegister(Positions pos) const{
     return pimpl->Parallel(&Module::getChipStatusRegister, pos);
 }
 
+void Detector::setGainCaps(int caps, Positions pos){
+    return pimpl->Parallel(&Module::setGainCaps, pos, caps);
+}
+
 
 // CTB/ Moench Specific
 
diff --git a/slsDetectorSoftware/src/Module.cpp b/slsDetectorSoftware/src/Module.cpp
index 69ac21e59..bb57e9509 100644
--- a/slsDetectorSoftware/src/Module.cpp
+++ b/slsDetectorSoftware/src/Module.cpp
@@ -2002,6 +2002,10 @@ int Module::getChipStatusRegister() const{
     return sendToDetector<int>(F_GET_CSR);
 }
 
+void Module::setGainCaps(int caps){
+    sendToDetector<int>(F_SET_GAIN_CAPS, caps);
+}
+
 // CTB / Moench Specific
 int Module::getNumberOfAnalogSamples() const {
     return sendToDetector<int>(F_GET_NUM_ANALOG_SAMPLES);
diff --git a/slsDetectorSoftware/src/Module.h b/slsDetectorSoftware/src/Module.h
index 8b3c6e842..a61951d66 100644
--- a/slsDetectorSoftware/src/Module.h
+++ b/slsDetectorSoftware/src/Module.h
@@ -427,6 +427,7 @@ class Module : public virtual slsDetectorDefs {
     std::array<time::ns, 3> getGateDelayForAllGates() const;
     bool isMaster() const;
     int getChipStatusRegister() const;
+    void setGainCaps(int caps);
 
     /**************************************************
      *                                                *
diff --git a/slsSupportLib/include/sls/sls_detector_defs.h b/slsSupportLib/include/sls/sls_detector_defs.h
index 3e2c4bbee..412c66e4a 100644
--- a/slsSupportLib/include/sls/sls_detector_defs.h
+++ b/slsSupportLib/include/sls/sls_detector_defs.h
@@ -394,6 +394,16 @@ typedef struct {
      */
     enum timingSourceType { TIMING_INTERNAL, TIMING_EXTERNAL };
 
+    //gain caps Mythen3
+    enum M3_GainCaps {
+        CSR_C10pre= 1<<7, 
+        CSR_C15sh = 1<<10, 
+        CSR_C30sh = 1<<11,
+        CSR_C50sh = 1<<12,
+        CSR_C225ACsh = 1<<13,
+        CSR_C15pre = 1<<14, 
+    };
+
 #ifdef __cplusplus
 
     /** scan structure */
@@ -625,6 +635,10 @@ typedef struct {
 #endif
 
 #ifdef __cplusplus
+
+
+
+
 // TODO! discuss this
 #include <vector> //hmm... but currently no way around
 namespace sls {
diff --git a/slsSupportLib/include/sls/sls_detector_funcs.h b/slsSupportLib/include/sls/sls_detector_funcs.h
index a99ac0e02..89acac836 100755
--- a/slsSupportLib/include/sls/sls_detector_funcs.h
+++ b/slsSupportLib/include/sls/sls_detector_funcs.h
@@ -222,6 +222,7 @@ enum detFuncs {
     F_GET_ALL_THRESHOLD_ENERGY,
     F_GET_MASTER,
     F_GET_CSR,
+    F_SET_GAIN_CAPS,
 
     NUM_DET_FUNCTIONS,
     RECEIVER_ENUM_START = 256, /**< detector function should not exceed this