/* Mix of L and R; -6dB down in amplitude (3dB in terms of power) */
shared_ptr<AudioBuffers> in_LR = in_L->clone ();
- in_LR->accumulate_frames (in_R.get(), 0, 0, in_R->frames ());
+ in_LR->accumulate_frames (in_R.get(), in_R->frames(), 0, 0);
in_LR->apply_gain (-6);
/* Run filters */