diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index 7473c26..2014762 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -1087,7 +1087,7 @@ bool DCCEXParser::parseI(Print *stream, int16_t params, int16_t p[])
         }
         return true;
     
-    case 2: // <I id position> - rotate to position for DCC turntables
+    case 2: // <I id DCC> | <I id position> - rotate or create DCC turntable
         {
             Turntable *tto = Turntable::get(p[0]);
             if (p[1] == HASH_KEYWORD_DCC) { // Create a DCC turntable
@@ -1096,7 +1096,7 @@ bool DCCEXParser::parseI(Print *stream, int16_t params, int16_t p[])
                 Turntable *tto = Turntable::get(p[0]);
                 tto->addPosition(0);
             } else {    // Otherwise move a DCC turntable
-                if (tto) {
+                if (tto && !tto->isEXTT()) {
                     if (!tto->setPosition(p[0], p[1])) return false;
                 } else {
                     return false;
@@ -1105,14 +1105,15 @@ bool DCCEXParser::parseI(Print *stream, int16_t params, int16_t p[])
         }
         return true;
 
-    case 3: 
+    case 3: // <I id ADD value> | <I id position activity>
         {
             Turntable *tto = Turntable::get(p[0]);
             if (!tto) return false;
-            if (p[1] == HASH_KEYWORD_ADD) { // <I id ADD value> add position value to turntable
+            if (p[1] == HASH_KEYWORD_ADD) { // Add position value to turntable
                 tto->addPosition(p[2]);
                 StringFormatter::send(stream, F("<i>\n"));
             } else {    // <I id position activity> rotate to position for EX-Turntable
+                if (!tto->isEXTT()) return false;
                 if (!tto->setPosition(p[0], p[1], p[2])) return false;
             }
         }
diff --git a/Turntables.cpp b/Turntables.cpp
index f7b2a46..f96a3a8 100644
--- a/Turntables.cpp
+++ b/Turntables.cpp
@@ -140,8 +140,8 @@ bool Turntable::setPosition(uint16_t id, uint8_t position, uint8_t activity) {
 
   if (ok) {
     // Broadcast a position change only if non zero has been set, or home/calibration sent
-    tto->_previousPosition = tto->getPosition();
     if (position > 0 || (position == 0 && (activity == 2 || activity == 3))) {
+      tto->_previousPosition = tto->getPosition();
       tto->_turntableData.position = position;
       if (tto->isEXTT()) {
         tto->setPositionStateOnly(id, position, 1);
@@ -179,6 +179,7 @@ using DevState = IODevice::DeviceStateEnum;
     }
     if (!IODevice::exists(vpin)) return nullptr;
     if (IODevice::getStatus(vpin) == DevState::DEVSTATE_FAILED) return nullptr;
+    if (Turntable::getByVpin(vpin)) return nullptr;
     tto = (Turntable *)new EXTTTurntable(id, vpin);
     DIAG(F("Turntable 0x%x size %d size %d"), tto, sizeof(Turntable), sizeof(struct TurntableData));
     return tto;