pw_filter: How to handle links from a stereo filter to a surround device?
One of the EasyEffects users reported that his soundcard does not have sound in the subwoofer channel https://github.com/wwmm/easyeffects/issues/1041. I know the reason why. My filters have 2 channels and I am linking them only to the left and right channels of the output device. Or the first 2 channels when the output device is in "pro" mode. The question is who should be doing the upmixing? It seems to me that the server is in a much better position to do that right. But as the filters have to be linked manually this task seems to be left to the client. I am not sure about the best way to handle this situation.