For streams: the name of a filter that is desired, e.g.\ "echo-cancel" or "equalizer-sink". PulseAudio may choose to not apply the filter if it does not make sense (for example, applying echo-cancellation on a Bluetooth headset probably does not make sense. \since 1.0
For streams: the name of a filter that is desired, e.g.\ "echo-cancel" or "equalizer-sink". PulseAudio may choose to not apply the filter if it does not make sense (for example, applying echo-cancellation on a Bluetooth headset probably does not make sense. \since 1.0