bool pre_seed (const ChanCount&, const ChanCount&, const ChanMapping&, const ChanMapping&, const ChanMapping&);
ChanMapping input_map () const; ///< combined (all instances) input map
+ ChanMapping no_sc_input_map () const; ///< combined (all instances) input map w/o sidechain sinks
ChanMapping output_map () const; ///< combined (all instances) output map
bool has_midi_bypass () const;
bool has_midi_thru () const;