int process (BufferSet&, framepos_t transport_frame, pframes_t nframes, framecnt_t &, bool need_disk_signal);
frameoffset_t calculate_playback_distance (pframes_t nframes);
int process (BufferSet&, framepos_t transport_frame, pframes_t nframes, framecnt_t &, bool need_disk_signal);
frameoffset_t calculate_playback_distance (pframes_t nframes);