Hello, When we have a filter sink that does some processing, currently the benefits of the flat volume feature are not really available. That's because if you have a music player that is connected to the filter sink, the hardware sink doesn't have any idea of the music player's stream volume. In order to fix this, Pulseaudio 0.9.15 on Maemo 5 was hacked to implement a feature that was dubbed "flat sink". The feature is still needed in Maemo 6 / MeeGo, and now we are finally trying to get it to upstream. The "flat sink" feature (better names welcome) works so that the filter sinks that want to avoid the previously described problem declare that they don't want to have independent volume, but they follow the master sink volume instead. Then the volume logic is changed so that the hardware sink calculates its real volume using also the streams connected to the filter sink in addition to the streams that are connected directly to the hardware sink. Basically we're trying to create an illusion that from volume point of view all streams are connected directly to the hardware sink, thus the stack of sinks collapses into a "flat sink". I hope that sounds like something that can be merged to upstream. There will be several patches, and I just sent the first. The rest of the patches are not ready yet - I'll send them as I finish them. -- Tanu
