void move (int from, int to, int frames);
void accumulate_channel (AudioBuffers const * from, int from_channel, int to_channel, float gain = 1);
void accumulate_frames (AudioBuffers const *, int read_offset, int write_offset, int frames);
void move (int from, int to, int frames);
void accumulate_channel (AudioBuffers const * from, int from_channel, int to_channel, float gain = 1);
void accumulate_frames (AudioBuffers const *, int read_offset, int write_offset, int frames);