Fixing two errors discovered while developing implementation tests:
Fixing two errors discovered while developing implementation tests:

1) mute flag was not properly treaded as a boolean
2) solo flag was not properly treaded as a boolean
eriser/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore