diff --git a/TeensyDSP/DSP.cpp b/TeensyDSP/DSP.cpp
index f1689c9..3f90fce 100644
--- a/TeensyDSP/DSP.cpp
+++ b/TeensyDSP/DSP.cpp
@@ -214,12 +214,12 @@ void UBitxDSP::txUSBIn() {
 /**********************************************************************/
 // RX filter settings
 
-const int minRxFilterLo = MIN_RX_FILTER_LO;
-const int maxRxFilterHi = MAX_RX_FILTER_HI;
-const int minRxFilterWidth = MIN_RX_FILTER_WIDTH;
-const int maxRxFilterWidth = MAX_RX_FILTER_WIDTH;
-const int minRxFilterCenter = MIN_RX_FILTER_CENTER;
-const int maxRxFilterCenter = MAX_RX_FILTER_CENTER;
+const float minRxFilterLo = MIN_RX_FILTER_LO;
+const float maxRxFilterHi = MAX_RX_FILTER_HI;
+const float minRxFilterWidth = MIN_RX_FILTER_WIDTH;
+const float maxRxFilterWidth = MAX_RX_FILTER_WIDTH;
+const float minRxFilterCenter = MIN_RX_FILTER_CENTER;
+const float maxRxFilterCenter = MAX_RX_FILTER_CENTER;
 
 /*!
  *  @brief  Bypass the RX audio filter.
@@ -238,7 +238,7 @@ void UBitxDSP::updateRxFilter() {
   rxFilter.begin(coefficients, NUM_COEFFICIENTS);
 }
 
-void UBitxDSP::setRxFilter(int lo, int hi) {
+void UBitxDSP::setRxFilter(float lo, float hi) {
   if (hi < lo + minRxFilterWidth) {
     hi = lo + minRxFilterWidth;
   }
@@ -256,7 +256,7 @@ void UBitxDSP::setRxFilter(int lo, int hi) {
   updateRxFilter();
 }
 
-void UBitxDSP::setRxFilterLo(int lo) {
+void UBitxDSP::setRxFilterLo(float lo) {
   if (lo > state.rxFilterHi - minRxFilterWidth) {
     lo = state.rxFilterHi - minRxFilterWidth;
   }
@@ -267,7 +267,7 @@ void UBitxDSP::setRxFilterLo(int lo) {
   updateRxFilter();
 }
 
-void UBitxDSP::setRxFilterHi(int hi) {
+void UBitxDSP::setRxFilterHi(float hi) {
   if (hi < state.rxFilterLo + minRxFilterWidth) {
     hi = state.rxFilterLo + minRxFilterWidth;
   }
@@ -278,27 +278,27 @@ void UBitxDSP::setRxFilterHi(int hi) {
   updateRxFilter();
 }
 
-void UBitxDSP::setRxFilterWidth(int width) {
+void UBitxDSP::setRxFilterWidth(float width) {
   if (width < minRxFilterWidth) {
     width = minRxFilterWidth;
   } else if (width > maxRxFilterWidth) {
     width = maxRxFilterWidth;
   }
-  int center = (state.rxFilterHi + state.rxFilterLo) / 2;
-  int lo = center - (width / 2);
-  int hi = center + (width / 2);
+  float center = (state.rxFilterHi + state.rxFilterLo) / 2;
+  float lo = center - (width / 2);
+  float hi = center + (width / 2);
   setRxFilter(lo, hi);
 }
 
-void UBitxDSP::setRxFilterCenter(int center) {
+void UBitxDSP::setRxFilterCenter(float center) {
   if (center < minRxFilterCenter) {
     center = minRxFilterCenter;
   } else if (center > maxRxFilterCenter) {
     center = maxRxFilterCenter;
   }
-  int width = state.rxFilterHi - state.rxFilterLo;
-  int lo = center - (width / 2);
-  int hi = center + (width / 2);
+  float width = state.rxFilterHi - state.rxFilterLo;
+  float lo = center - (width / 2);
+  float hi = center + (width / 2);
   setRxFilter(lo, hi);
 }
 
diff --git a/TeensyDSP/DSP.h b/TeensyDSP/DSP.h
index fe293a8..54a7069 100644
--- a/TeensyDSP/DSP.h
+++ b/TeensyDSP/DSP.h
@@ -9,12 +9,12 @@
 #include <dynamicFilters.h>
 #include "Debug.h"
 
-#define MIN_RX_FILTER_LO      0
-#define MAX_RX_FILTER_HI      5000
-#define MIN_RX_FILTER_WIDTH   0
-#define MAX_RX_FILTER_WIDTH   5000
-#define MIN_RX_FILTER_CENTER  0
-#define MAX_RX_FILTER_CENTER  5000
+#define MIN_RX_FILTER_LO      0.0
+#define MAX_RX_FILTER_HI      5000.0
+#define MIN_RX_FILTER_WIDTH   0.0
+#define MAX_RX_FILTER_WIDTH   5000.0
+#define MIN_RX_FILTER_CENTER  0.0
+#define MAX_RX_FILTER_CENTER  5000.0
 
 #define DSP_MILLIS_PER_UPDATE 100
 
@@ -41,8 +41,8 @@ struct DSPState {
   // RX audio output settings
 
   // RX filter settings
-  int rxFilterLo = 300;
-  int rxFilterHi = 3000;
+  float rxFilterLo = 300.0;
+  float rxFilterHi = 3000.0;
 
   // TX audio input settings
   float txInLvl[4] = {0.5, 0.5, 0.0, 0.0};
@@ -86,11 +86,11 @@ class UBitxDSP {
 
   // RX filter settings
   void bypassRxFilter();
-  void setRxFilter(int lo, int hi);
-  void setRxFilterLo(int lo);
-  void setRxFilterHi(int hi);
-  void setRxFilterWidth(int width);
-  void setRxFilterCenter(int center);
+  void setRxFilter(float lo, float hi);
+  void setRxFilterLo(float lo);
+  void setRxFilterHi(float hi);
+  void setRxFilterWidth(float width);
+  void setRxFilterCenter(float center);
 
   /*!
    *  @brief  Get the current low frequency bound of the RX band pass filter.
diff --git a/TeensyDSP/Rig.h b/TeensyDSP/Rig.h
index 65cf04c..9137863 100644
--- a/TeensyDSP/Rig.h
+++ b/TeensyDSP/Rig.h
@@ -3,15 +3,56 @@
 
 #include "RigState.h"
 
+#define DEFAULT_SSB_LO_CUT  300.0
+#define DEFAULT_SSB_HI_CUT  3000.0
+#define DEFAULT_CW_WIDTH    500.0
+#define DEFAULT_LOW_USB     false
+#define DEFAULT_LOW_CWU     true
+#define DEFAULT_HIGH_USB    true
+#define DEFAULT_HIGH_CWU    true
+
+enum HamBand {
+  BAND_80M = 0,
+  BAND_60M,
+  BAND_40M,
+  BAND_30M,
+  BAND_20M,
+  BAND_17M,
+  BAND_15M,
+  BAND_12M,
+  BAND_10M,
+  NUM_BANDS
+};
+
+struct ModeConfig {
+  bool isUpper;
+  float dspLo;
+  float dspHi;
+};
+
+struct BandConfig {
+  ModeConfig cw;
+  ModeConfig ssb;
+};
+
+struct RigConfig {
+  //bool isData = false;
+  bool useUSBInput = true;  // whether or not to use the USB input for data
+};
+
 class UBitxRig {
   public:
+  UBitxRig();
+  
   inline void begin() {}
   inline void update() {}
   
   inline unsigned getFreqA() const { return radState.getFreqA(); }
   inline unsigned getFreqB() const { return radState.getFreqB(); }
+  
   inline int getRIT() const { return radState.getRIT(); }
   inline int getXIT() const { return radState.getXIT(); }
+  
   inline bool isVFOA() const { return radState.isVFOA(); }
   inline bool isVFOB() const { return radState.isVFOB(); }
   inline bool isSplit() const { return radState.isSplit(); }
@@ -22,12 +63,20 @@ class UBitxRig {
   inline bool isModeCWR() const { return radState.isModeCWR(); }
   inline bool isModeUSB() const { return radState.isModeUSB(); }
   inline bool isModeLSB() const { return radState.isModeLSB(); }
+
+  inline float getCWSidetone() const { return static_cast<float>(radState.getSidetone()); }
+
+  inline bool isUSBInput() const { return conf.useUSBInput; }
+  inline bool isLineInput() const { return !conf.useUSBInput; }
+  
   inline bool isAI() const { return autoInfo; }
 
   inline void setFreqA(unsigned freq) { catState.setFreqA(freq); }
   inline void setFreqB(unsigned freq) { catState.setFreqB(freq); }
+  
   inline void setRIT(int freq) { catState.setRIT(freq); }
   inline void setXIT(int freq) { catState.setXIT(freq); }
+  
   inline void setVFOA() { catState.setVFOA(); }
   inline void setVFOB() { catState.setVFOB(); }
   inline void setSplitOn() { catState.setSplitOn(); }
@@ -36,10 +85,15 @@ class UBitxRig {
   inline void setRITOff() { catState.setRITOff(); }
   inline void setXITOn() { catState.setXITOn(); }
   inline void setXITOff() { catState.setXITOff(); }
-  inline void setCW() { catState.setCW(); }
-  inline void setCWR() { catState.setCWR(); }
-  inline void setUSB() { catState.setUSB(); }
-  inline void setLSB() { catState.setLSB(); }
+  inline void setModeCW() { catState.setModeCW(); }
+  inline void setModeCWR() { catState.setModeCWR(); }
+  inline void setModeUSB() { catState.setModeUSB(); }
+  inline void setModeLSB() { catState.setModeLSB(); }
+
+  inline void setCWSidetone(float f) { catState.setSidetone(static_cast<uint16_t>(f)); }
+
+  inline void setUSBInput() { conf.useUSBInput = true; }
+  inline void setLineInput() { conf.useUSBInput = false; }
 
   inline void aiOn() { autoInfo = true; }
   inline void aiOff() { autoInfo = false; }
@@ -58,10 +112,13 @@ class UBitxRig {
   //void setBand();
   //void getBand();
 
-  private:
+  private:  
+  RigConfig conf;
   UBitxRigState catState;
   UBitxRigState radState;  
   bool autoInfo = false;
+
+  BandConfig band[NUM_BANDS];
 };
 
 extern UBitxRig Rig;
diff --git a/TeensyDSP/RigState.cpp b/TeensyDSP/RigState.cpp
index da25d38..28bc836 100644
--- a/TeensyDSP/RigState.cpp
+++ b/TeensyDSP/RigState.cpp
@@ -56,7 +56,7 @@ void UBitxRigState::begin() {
 #include "ubitx.h"
 #include "ubitx_eemap.h"
 
-extern unsigned long frequency, ritRxFrequency, ritTxFrequency;
+extern unsigned long frequency, ritRxFrequency, ritTxFrequency, sideTone;
 extern unsigned long vfoA;
 extern unsigned long vfoB;
 extern char cwMode;
@@ -169,8 +169,10 @@ void UBitxRigState::writeDirty() {
     // XIT - TODO
   }
 
-  // VFO A/B selection
+  // Various flags
   if (isDirty(FLAGS_WORD)) {
+
+    // VFO A/B selection
     char prev = vfoActive;
     vfoActive = isVFOA() ? VFO_A : VFO_B;
     if (vfoActive != prev) {
@@ -214,6 +216,13 @@ void UBitxRigState::writeDirty() {
       setFrequency(frequency);
     }
   }
+
+  // Keyer information
+  if (isDirty(KEYER_WORD)) {
+    
+    // Sidetone frequency
+    sideTone = static_cast<unsigned long>(getSidetone());
+  }
 }
 
 /*!
@@ -284,17 +293,22 @@ void UBitxRigState::readDirty() {
   char curr = (cwMode << 1) | isUSB;
   if (curr != prev) {
     if (cwMode == 2) {
-      setCW();
+      setModeCW();
     } else if (cwMode == 1) {
-      setCWR();
+      setModeCWR();
     } else {
       if (isUSB) {
-        setUSB();
+        setModeUSB();
       } else {
-        setLSB();
+        setModeLSB();
       }
     }
   }
+
+  // Sidetone
+  if (getSidetone() != static_cast<uint16_t>(sideTone)) {
+    setSidetone(static_cast<uint16_t>(sideTone));
+  }
 }
 
 /***********************************************************************
@@ -332,6 +346,16 @@ void UBitxRigState::receive_RIGINF(int numBytes) {
     }
   }
 
+  //--------------------------------------------------------------------
+  // Do anything that needs to happen when something is updated by the 
+  // Raduino... this would be due to e.g. changes through the menu.
+  // Current (as of 2/19/2021) things that DON'T need to have any
+  // updates: frequency (those just get requested by CAT as needed).  
+  // Current things that do need to get updated: sidetone (used to
+  // update CW filter values).
+  //--------------------------------------------------------------------
+  processDirty();
+
   IFDEBUG( serialHexState("Rcvd") );
   IFDEBUG( serialPrettyState("Rcvd") );
 }
@@ -372,6 +396,13 @@ void UBitxRigState::send_RIGINF() {
   //--------------------------------------------------------------------  
 }
 
+/*!
+ *  @brief  Perform required actions based on any dirty bits set.
+ */
+void UBitxRigState::processDirty() {
+  
+}
+
 #endif
 
 #ifdef DEBUG
diff --git a/TeensyDSP/RigState.h b/TeensyDSP/RigState.h
index a50d5e5..05f26be 100644
--- a/TeensyDSP/RigState.h
+++ b/TeensyDSP/RigState.h
@@ -15,6 +15,9 @@
 #define UBITX_USB_FLAG    0x00000020
 #define UBITX_TX_FLAG     0x00000040
 
+#define UBITX_SIDETONE_MASK   0x000007FF
+#define UBITX_KEYER_MODE_MASK 0x00003800
+
 #ifdef TEENSYDUINO
 #define DISABLEINTS(CMD) do { noInterrupts(); CMD; interrupts(); } while (0)
 #else
@@ -27,6 +30,7 @@ enum RigStateWord {
   VFOB_WORD,
   OFFSETS_WORD,
   FLAGS_WORD,
+  KEYER_WORD,
   NUM_WORDS
 };
 
@@ -255,25 +259,25 @@ struct UBitxRigState {
     return result;
   }
   
-  inline void setUSB(bool mark = true) { 
+  inline void setModeUSB(bool mark = true) { 
     DISABLEINTS( data[FLAGS_WORD] |= UBITX_USB_FLAG; 
                  data[FLAGS_WORD] &= ~UBITX_CW_FLAG; 
                  if (mark) setDirty(FLAGS_WORD) );
   }
   
-  inline void setLSB(bool mark = true) { 
+  inline void setModeLSB(bool mark = true) { 
     DISABLEINTS( data[FLAGS_WORD] &= ~UBITX_USB_FLAG; 
                  data[FLAGS_WORD] &= ~UBITX_CW_FLAG; 
                  if (mark) setDirty(FLAGS_WORD) );
   }
   
-  inline void setCW(bool mark = true)  { 
+  inline void setModeCW(bool mark = true)  { 
     DISABLEINTS( data[FLAGS_WORD] |= UBITX_USB_FLAG; 
                  data[FLAGS_WORD] |= UBITX_CW_FLAG; 
                  if (mark) setDirty(FLAGS_WORD) );
   }
   
-  inline void setCWR(bool mark = true) { 
+  inline void setModeCWR(bool mark = true) { 
     DISABLEINTS( data[FLAGS_WORD] &= ~UBITX_USB_FLAG; 
                  data[FLAGS_WORD] |= UBITX_CW_FLAG; 
                  if (mark) setDirty(FLAGS_WORD) );
@@ -309,6 +313,18 @@ struct UBitxRigState {
     return result; 
   }
 
+  inline void setSidetone(uint16_t f, bool mark = true) {
+    DISABLEINTS( data[KEYER_WORD] &= ~UBITX_SIDETONE_MASK;
+                 data[KEYER_WORD] |= (uint32_t(f) & UBITX_SIDETONE_MASK);
+                 if (mark) setDirty(KEYER_WORD) );
+  }
+
+  inline uint16_t getSidetone() {
+    uint32_t result;
+    DISABLEINTS( result = data[KEYER_WORD] & UBITX_SIDETONE_MASK );
+    return uint16_t(result);
+  }
+
 #ifdef DEBUG
   void serialHexState(const char* label);
   void serialPrettyState(const char* label);
@@ -319,6 +335,9 @@ struct UBitxRigState {
   // RigState, not in the TeensyDSP (Teensy) case.
   void writeDirty();  // write fields FROM RigState TO Raduino
   void readDirty();   // read variables FROM Raduino TO RigState
+#else
+  // These methods are only defined (currently) in the TeensyDSP case.
+  void processDirty();
 #endif
 };
 
diff --git a/TeensyDSP/TR.h b/TeensyDSP/TR.h
index 9700e51..61e0ab8 100644
--- a/TeensyDSP/TR.h
+++ b/TeensyDSP/TR.h
@@ -19,6 +19,12 @@ const int uBitxTRPttPin = UBITX_TR_PTT_PIN;
 const int uBitxTRVoxPin = UBITX_TR_VOX_PIN;
 const int uBitxTRKeyPin = UBITX_TR_KEY_PIN;
 
+struct TxSource {
+  MIC_SOURCE = 0,
+  LINE_SOURCE,
+  USB_SOURCE, 
+};
+
 class UBitxTR {
   public:
   UBitxTR(UBitxDSP& d, int out = uBitxTROutPin, int p = uBitxTRPttPin, int v = uBitxTRVoxPin, int k = uBitxTRKeyPin):
@@ -63,9 +69,10 @@ class UBitxTR {
   inline bool catActivated() { return (L_catActive != catActive) && L_catActive; }
   inline bool catDeactivated() { return (L_catActive != catActive) && catActive; }
   
-  inline void catTX() {
+  inline void catTX(TxSource src) {
     L_catActive = catActive;
     catActive = true;
+    txSource = src;
   }
 
   inline void catRX() {
@@ -73,10 +80,11 @@ class UBitxTR {
     catActive = false;
   }
 
-//======================================================================
+  //====================================================================
 
   inline bool transmitting() { return isTX;  }
   inline bool receiving() { return !isTX; }
+  inline TxSource source() const { return txSource; }
 
   /*!
    *  @brief  Check if any of the PTT's have been pressed or released 
@@ -145,6 +153,7 @@ class UBitxTR {
   bool L_keyDown = false;
   bool catActive = false;
   bool L_catActive = false;
+  TxSource txSource = MIC_SOURCE;
 };
 
 extern UBitxTR TR;
diff --git a/TeensyDSP/TS590.cpp b/TeensyDSP/TS590.cpp
index 3f51806..9fea333 100644
--- a/TeensyDSP/TS590.cpp
+++ b/TeensyDSP/TS590.cpp
@@ -41,8 +41,6 @@ TS590Command::TS590Command(const char* pre) {
   }
 }
 
-TS590Command::~TS590Command() {}
-
 /*!
  *  @brief  Determine whether this is a Read command or not.  by
  *          default, if it's a 2-letter command, it's a Read.
@@ -139,8 +137,18 @@ void TS590Command::setDSP(UBitxDSP* d) {
   theDSP = d;
 }
 
+/*!
+ *  @brief  Set the T/R that will be used to process commands.
+ *  @param  t
+ *          Pointer to the UBitxTR object.
+ */
+void TS590Command::setDSP(UBitxTR* t) {
+  theTR = t;
+}
+
 UBitxRig* TS590Command::theRig = &Rig;
 UBitxDSP* TS590Command::theDSP = &DSP;
+UBitxTR* TR590Command::theTR = &TR;
 TS590Error TS590Command::theError = NoError;
 
 /**********************************************************************/
@@ -238,19 +246,19 @@ void TS590_MD::handleCommand(const char* cmd) {
       break;
 
       case '1': // LSB
-      rig()->setLSB();
+      rig()->setModeLSB();
       break;
 
       case '2': // USB
-      rig()->setUSB();
+      rig()->setModeUSB();
       break;
 
       case '3': // CW
-      rig()->setCW();
+      rig()->setModeCW();
       break;
 
       case '7': // CW-R
-      rig()->setCWR();
+      rig()->setModeCWR();
       break;
 
       default:
@@ -319,6 +327,123 @@ void TS590_SL::sendResponse(const char* cmd) {
 
 /**********************************************************************/
 
+void TS590_TX::handleCommand(const char* cmd) {
+  if (strlen(cmd) == 3) {
+    switch (cmd[2]) {
+      case '0':
+      tr.catTX(MIC_SOURCE);
+      break;
+
+      case '1':
+      tr.catTX(rig.isUSBInput() ? USB_INPUT : LINE_INPUT);
+      break;
+
+      case '2':
+      // TODO: Need to implement w/ Teensy Audio Tool.
+      //tr.catTX();
+      break;
+
+      default:
+      setSyntaxError();
+    }
+  } else if (strlen(cmd) == 2) {
+    tr.catTX(MIC_SOURCE);
+  } else {
+    setSyntaxError();
+  }
+}
+
+void TS590_TX::sendResponse(const char* cmd) {
+  char src;
+  switch (tr.source()) {
+    case MIC_SOURCE:
+    src = '0';
+    break;
+
+    case LINE_SOURCE:
+    case USB_SOURCE:
+    src = '1';
+    break;
+  }
+  ts590SeondCommand("TX%1c", src);
+}
+
+/**********************************************************************/
+
+/*!
+ *  @brief  Create a new CAT EX command.  It should be initialized with
+ *          a 3-character P1 parameter (command number).
+ *  @param  pre
+ *          A 3-character command prefix.  If more than 3 characters
+ *          are supplied, only the first two will be used.  If less
+ *          than three are supplied, then the command will be
+ *          initialized with a null prefix.
+ */
+TS590EXCommand::TS590EXCommand(const char* P1):
+TS590Command("EX") { 
+  if (strlen(P1) >= 3) {
+    strncpy(myMenu, P1, 3);
+  }
+}
+
+/*!
+ *  @brief  Determine whether this is a Read command or not.  by
+ *          default, if it's a 2-letter command, it's a Read.
+ *  @return True if a Read command; false otherwise.
+ */
+bool TS590EXCommand::isReadCommand(const char* cmd) const {
+  if (strlen(cmd) == 9) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+void TS590EXCommand::sendResponse(const char* cmd) {
+  ts590sendCommand("%2c%3c0000%s", prefix(), menu(), getReturnValue());
+}
+
+/**********************************************************************/
+
+void TS590_EX034::handleCommand(const char* cmd) {
+  if (strlen(cmd) == 10 || strlen(cmd) == 11) {
+    index = (uint8_t)atol(&cmd[9]);
+    if (index < 15) {
+      rig().setCWSidetone(300.0 + (float)(index * 50));
+    } else {
+      setSyntaxError();
+    }
+  } else {
+    setSyntaxError();
+  }
+}
+
+void TS590_EX034::sendResponse(const char* cmd) {
+  ts590SendCommand("EX0340000%02d", index % 15);
+}
+
+/**********************************************************************/
+
+void TS590_EX063::handleCommand(const char* cmd) {
+  if (strlen(cmd) == 10) {
+    if (cmd[9] == '0') {
+      rig().setLineInput();
+    } else if (cmd[9] == '1') {
+      rig().setUSBInput();
+    } else {
+      setSyntaxError();
+    }
+  } else {
+    setSyntaxError();
+  }
+}
+
+void TS590_EX063::sendResponse(const char* cmd) {
+  ts590SendCommand("EX0630000%1c", rig().isUSBInput() ? '1' : '0');
+}
+
+/**********************************************************************/
+
 TS590_FA cmdFA;
 TS590_FB cmdFB;
 TS590_FR cmdFR;
@@ -393,8 +518,27 @@ int compareCATCommands(const void* a, const void* b) {
   return cmp;
 }
 
+int compareCATEXCommands(const void* a, const void* b) {
+  TS590Command const *B = *(TS590Command const **)b;
+  int cmp = strncmp((char*)a, (char*)B->prefix(), 5);
+  #ifdef DEBUG
+    Serial.print("Comparison: ");
+    Serial.print((char*)a);
+    Serial.print(" ? ");
+    Serial.print((char*)B->prefix());
+    Serial.print(" --> ");
+    Serial.println(cmp);
+  #endif
+  return cmp;
+}
+
 void UBitxTS590::processCommand() {
-  TS590Command** cmd = (TS590Command**)bsearch(buf, commands, numCommands, sizeof(TS590Command*), compareCATCommands);
+  TS590Command** cmd;
+  if (strncmp(buf, "EX", 2) == 0) {
+    cmd = (TS590Command**)bsearch(buf, commands, numCommands, sizeof(TS590Command*), compareCATEXCommands);
+  } else {
+    cmd = (TS590Command**)bsearch(buf, commands, numCommands, sizeof(TS590Command*), compareCATCommands);
+  }
   if (cmd == NULL) {
     ts590SyntaxError();
   } else {
diff --git a/TeensyDSP/TS590.h b/TeensyDSP/TS590.h
index 2f1b6a4..39d6061 100644
--- a/TeensyDSP/TS590.h
+++ b/TeensyDSP/TS590.h
@@ -4,9 +4,13 @@
 #include <Arduino.h>
 #include "DSP.h"
 #include "Rig.h"
+#include "TR.h"
 
 /**********************************************************************/
 
+// uncomment to use TS-590SG / comment to use TS-590S
+#define USE_TS590SG
+
 #define TS590_COMMAND_MAX_LENGTH  50 // including terminator (which will get converted to null)
 
 const int ts590CommandMaxLength = TS590_COMMAND_MAX_LENGTH;
@@ -62,6 +66,11 @@ class TS590Command {
    */
   inline UBitxDSP* dsp() const { return theDSP; }
 
+  /*!
+   *  @brief  Return the T/R that this command will be used to control.
+   */
+  inline UBitxDSP* tr() const { return theTR; }
+
   /*!
    *  @brief  Handle the provided Set command.  If the Set command
    *          results in an error, then set the appropriate flag with
@@ -88,6 +97,7 @@ class TS590Command {
   static void setProcessError();
   static void setRig(UBitxRig* r);
   static void setDSP(UBitxDSP* d);
+  static void setTR(UBitxTR* t);
 
   private:
   char myPrefix[3] = "\0\0";
@@ -192,6 +202,133 @@ class TS590_SL : public TS590Command {
   unsigned index;
 };
 
+/*!
+ *  @brief  CAT command to start transmitting.
+ */
+class TS590_TX : public TS590Command {
+  public:
+  TS590_TX(): TS590Command("TX") {}
+  virtual void handleCommand(const char* cmd);
+  virtual void sendResponse(const char* cmd);
+};
+
+/**********************************************************************/
+
+class TS590EXCommand : public TS590Command {
+  public:
+  TS590EXCommand(const char *P1);
+  virtual ~TS590EXCommand() = 0;
+
+  inline const char* menu() const { return &myMenu[0]; }
+
+  virtual const char* getReturnValue() const = 0;
+
+  virtual void sendResponse(const char* cmd);
+
+  private:
+  char myMenu[4] = "\0\0\0";
+};
+
+/**********************************************************************/
+
+/*!
+ *  @brief  CAT command for setting the sidetone pitch/frequency.
+ */
+class TS590_EX034 : public TS590EXCommand {
+  public:
+  TS590_EX034(): TS590EXCommand("034") {}
+  virtual void handleCommand(const char* cmd);
+  virtual const char* getReturnValue();
+  private:
+  uint8_t index;
+};
+
+/*!
+ *  @brief  CAT command for selecting the data input line.
+ */
+class TS590_EX063 : public TS590EXCommand {
+  public:
+  TS590_EX063(): TS590EXCommand("063") {}
+  virtual void handleCommand(const char* cmd);
+  virtual const char* getReturnValue();
+};
+
+/**********************************************************************/
+
+/*!
+ *  @brief  CAT command for setting USB/Line audio input levels.
+ */
+template<bool USB, bool SG>
+class TS590_EXDataAudioInLevel : public TS590EXCommand {
+  public:
+  TS590_EXDataAudioInLevel(): TS590EXCommand(USB ? (SG ? "071" : "064") : (SG ? "073" : "066")) {}
+
+  virtual void handleCommand(const char* cmd) {
+    if (strlen(cmd) == 10) {
+      uint8_t val = (cmd[9] - 48) % 10;
+      if (USB) {
+        // set USB input level
+      } else {
+        // set Line input level
+      }
+    } else {
+      setSyntaxError();
+    }
+  }
+
+  virtual const char* getReturnValue() {
+    static char str[2] = "\0";
+    // get input level - decimal 0 to 9 ... str[1] = ...
+    return str;
+  }
+};
+
+#ifdef USE_TS590SG
+typedef TS590_EXDataAudioInLevel<true, true> TS590_EX071;
+typedef TS590_EXDataAudioInLevel<false, true> TS590_EX073;
+#else
+typedef TS590_EXDataAudioInLevel<true, false> TS590_EX064;
+typedef TS590_EXDataAudioInLevel<true, false> TS590_EX066;
+#endif
+
+/**********************************************************************/
+
+/*!
+ *  @brief  CAT command for setting USB/Line audio output levels.
+ */
+template<bool USB, bool SG>
+class TS590_EXDataAudioOutLevel : public TS590EXCommand {
+  public:
+  TS590_EXDataAudioOutLevel(): TS590EXCommand(USB ? (SG ? "072" : "065") : (SG ? "074" : "067")) {}
+
+  virtual void handleCommand(const char* cmd) {
+    if (strlen(cmd) == 10) {
+      uint8_t val = (cmd[9] - 48) % 10;
+      if (USB) {
+        // set USB output level
+      } else {
+        // set Line output level
+      }
+    } else {
+      setSyntaxError();
+    }
+  }
+
+  virtual const char* getReturnValue() {
+    static char str[2] = "\0";
+    // get output level - decimal 0 to 9 ... str[1] = ...
+    return str;
+  }
+};
+
+#ifdef USE_TS590SG
+typedef TS590_EXDataAudioOutLevel<true, true> TS590_EX072;
+typedef TS590_EXDataAudioOutLevel<false, true> TS590_EX074;
+#else
+typedef TS590_EXDataAudioOutLevel<true, false> TS590_EX065;
+typedef TS590_EXDataAudioOutLevel<true, false> TS590_EX067;
+#endif
+
 /**********************************************************************/
 
 class UBitxTS590 {