fixed a bug and started implementing mixDown


Signed-off-by: Maximilian Marcoll <quince@maximilianmarcoll.de>
added a mixDown method (still unfunctional, though)


Signed-off-by: Maximilian Marcoll <quince@maximilianmarcoll.de>
CsoundPlayer MixDown now functional!


Signed-off-by: Maximilian Marcoll <quince@maximilianmarcoll.de>
mix down again (should be called via the "Current" menu item for now (csoundplayer needs data from the session i think))

Signed-off-by: Maximilian Marcoll <quince@maximilianmarcoll.de>