virtual void distribute_one (AudioBuffer&, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which) = 0;
virtual void distribute_one_automated (AudioBuffer&, BufferSet& obufs,
virtual void distribute_one (AudioBuffer&, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which) = 0;
virtual void distribute_one_automated (AudioBuffer&, BufferSet& obufs,