Hello, I'm looking for some advice on how to go about a task I need to do. Some time ago, I developed an ALSA driver (codec, I2S and soundcard) and a set of PulseAudio CLI scripts for an in-house designed 24 channel audio card. This worked well for a static setup that didn't need any dynamic control. Now, however, we have a requirement for some dynamic control. In particular, PTT (push-to-talk) and conditional filtering on some channels. For PTT, some audio outputs need to be conditionally muted according to the state of the PTT signals. The conditional filtering is required for a channel that is connected to a radio, which when in FM mode requires pre-emphasis on output and de-emphasis on input. Both the state of the PTT signals and the mode requiring filtering are detected in software. How can I go about doing this? My PulseAudio knowledge is limited to config and CLI. The fact that there are ALSA and PulseAudio utilities that allow dynamic muting says to me that it should be possible to do it in software according to PTT, but it is a mystery to me how it's done. Also, from the PulseAudio module documentation I can see a "module-ladspa-sink" module that allows for filtering, but I don't see how I can turn it on and off dynamically. Thanks, Steve
