All credit should go to Copernicus. He has done the hard work with audio and dbus and stuff. All I have done is a few small tweaks in the configuration. The original documentation warns about a potential lag iin recording/playback start/stop/pause commands - the audio subsystem takes some time to set up. I may have made it worse by a more complex file name generation. Luckily, I have an idea how to deal with that. My next plan is to look into the dbus stuff to see what can be done about the background operation. Triggering on a ring rather than on the connection is a good idea, I will look into thar at the same time.