/* L + R minus 6dB (in terms of amplitude) */
shared_ptr<AudioBuffers> in_LR = in->channel(0);
- in_LR->accumulate_frames (in->channel(1).get(), 0, 0, in->frames());
+ in_LR->accumulate_frames (in->channel(1).get(), in->frames(), 0, 0);
in_LR->apply_gain (-6);
if (channels > 0) {