EMU_RECSRC_NOTSET
if (voice->dataloc.source != EMU_RECSRC_NOTSET) {
voice->dataloc.source = EMU_RECSRC_NOTSET;
voice->dataloc.source = EMU_RECSRC_NOTSET;
case EMU_RECSRC_NOTSET:
case EMU_RECSRC_NOTSET: