void copy_from (AudioBuffers const * from, int frames_to_copy, int read_offset, int write_offset);
void move (int from, int to, int frames);
- void accumulate_channel (AudioBuffers const *, int, int);
+ void accumulate_channel (AudioBuffers const *, int, int, float gain = 1);
void accumulate_frames (AudioBuffers const *, int read_offset, int write_offset, int frames);
private: