> When testing with a52, reducing the volume of the Front Centre channel > to 50% vs. 100% for the others, causes a high pitched artefact to be > introduced. > > exporting PULSE_NO_SIMD=1 prevents the problem (although I do still seem > to get some artefacts when mixing - but this could be due to lack of > rewind on a52 or somehow related to that). > > Just mentioning here by way of recording the issue. I've had the same issue for ages when playing back multichannel files, be that on a HDMI or local stereo out. When all the channels have the same volume everything's fine. When a single channel has a different setting from the others, there' s this high-frequency pitch. It's been a year at least but I've never had the time to look into this. -Pierre
