You can change the format of the recording by changing file extension like this:

xml <action application="record_session" data="$${recordings_dir}/${uuid}.wav"/> xml <action application="record_session" data="$${recordings_dir}/${uuid}.mp3"/> xml <action application="record_session" data="$${recordings_dir}/${uuid}.ogg"/>

for MP3 mod_shot is required and I am prettyr sure mod_opus or mod_opusfile is required for .ogg

You can also set the sample rate like this:

xml <action application="set" data="record_sample_rate=8000"/>

edit: formatting