diff --git a/common/JackNetAPI.cpp b/common/JackNetAPI.cpp
index 72e525f4..ac9cc561 100644
--- a/common/JackNetAPI.cpp
+++ b/common/JackNetAPI.cpp
@@ -844,6 +844,8 @@ struct JackNetExtSlave : public JackNetSlaveInterface, public JackRunnableInterf
             return SOCKET_ERROR;
         }
         
+        if (fFrames < 0) fFrames = fParams.fPeriodSize;
+        
         fProcessCallback(fFrames,
                         fParams.fSendAudioChannels,
                         fAudioCaptureBuffer,
diff --git a/common/JackNetTool.cpp b/common/JackNetTool.cpp
index b695b8b6..8dfbcf83 100644
--- a/common/JackNetTool.cpp
+++ b/common/JackNetTool.cpp
@@ -996,23 +996,23 @@ namespace Jack
     
     int NetIntAudioBuffer::RenderFromJackPorts()
     {
-        // Count active ports
-        int active_ports = 0;
         for (int port_index = 0; port_index < fNPorts; port_index++) {
             if (fPortBuffer[port_index]) {
                 for (uint frame = 0; frame < fPeriodSize; frame++) {
-                    fIntBuffer[port_index][frame] = short(fPortBuffer[port_index][frame] * 32768.f);
+                    fIntBuffer[port_index][frame] = short(fPortBuffer[port_index][frame] * 32767.f);
                 }
-                active_ports++;
+            } else {
+                memset(fIntBuffer[port_index], 0, fPeriodSize * sizeof(short));
             }
         }
         
-        return active_ports;
+        // All ports active
+        return fNPorts;
     }
 
     void NetIntAudioBuffer::RenderToJackPorts()
     {
-        float coef = 1.f / 32768.f;
+        float coef = 1.f / 32767.f;
         for (int port_index = 0; port_index < fNPorts; port_index++) {
             if (fPortBuffer[port_index]) {
                 for (uint frame = 0; frame < fPeriodSize; frame++) {
diff --git a/common/JackNetTool.h b/common/JackNetTool.h
index 4222363e..bb7cef11 100644
--- a/common/JackNetTool.h
+++ b/common/JackNetTool.h
@@ -180,7 +180,7 @@ namespace Jack
         uint32_t fActivePorts;      //number of active ports
         uint32_t fCycle;            //process cycle counter
         uint32_t fSubCycle;         //midi/audio subcycle counter
-        uint32_t fFrames;           //process cycle size in frames
+        int32_t fFrames;            //process cycle size in frames (can be -1 to indicate entire buffer)
         uint32_t fIsLastPckt;       //is it the last packet of a given cycle ('y' or 'n')
     } POST_PACKED_STRUCTURE;