Reject group track with volume, panning, Send or reverb

README.md

@@ -45,6 +45,8 @@ these guidelines:
 - You can only use one **OidosReverb** instance. This is typically placed
   on a Send track, with some tracks routed to it. For each instrument, either
   all or none of the note columns using that instrument can have reverb.
+- You can use group tracks, but only for visual grouping. You can not use
+  volume, panning, Send devices or reverb on group tracks.
 - You can use the pattern sequence matrix to selectively mute tracks at
   certain pattern positions.
 - Globally muted tracks or note columns will not be included. Solo state is

convert/OidosConvert.py

@@ -677,6 +677,20 @@ def makeTracks(xsong, ticklength):
 		else:
 			instruments.append(None)
 
+	for xgrouptrack in xsong.Tracks.SequencerGroupTrack:
+		tname = xgrouptrack.Name
+		xdevices = xgrouptrack.FilterDevices.Devices
+		for xmixer in xdevices.GroupTrackMixerDevice:
+			if isactive(xmixer):
+				if float(xmixer.Volume.Value) != 1.0 or float(xmixer.PostVolume.Value) != 1.0:
+					raise InputException("Group track '%s' has non-zero volume" % tname);
+				if float(xmixer.Panning.Value) != 0.5 or float(xmixer.PostPanning.Value) != 0.5:
+					raise InputException("Group track '%s' has non-center panning" % tname);
+		if isactive(xdevices.SendDevice):
+			raise InputException("Group track '%s' uses Send" % tname);
+		if isactive(xdevices.AudioPluginDevice):
+			raise InputException("Group track '%s' uses reverb" % tname);
+
 	for tr,xtrack in enumerate(xsong.Tracks.SequencerTrack):
 		if str(xtrack.State) != "Active":
 			continue