some initial work to try and handle cases of crossfading between signals with differing numbers of channels
some initial work to try and handle cases of crossfading between signals with differing numbers of channels

git-svn-id: 70e004b0fe139654417ecae95160fb6d1b675565@484 bc2ad3ca-9a4d-0410-8d14-35da9c29b421

jamoma/JamomaCore,jamoma/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,eriser/JamomaCore,eriser/JamomaCore,eriser/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,jamoma/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,eriser/JamomaCore