I think that I am looking for some serious knowledge about the PD or Wish executable (in Windows at least).

I have noticed that newly created patches "just" use the current audio/midi setup..., but patches that have had their audio/midi setup changed by switches at load will load without any parameters unless they are again specified at load (in a batch file). This is of course very much the most useful behaviour.

But where is the audio/midi setup information stored for each patch?. I have searched, and I cannot find any reference from within (my) patches.

I would (very much) like to be able to read (and better still write) to:

audioindev
audiooutdev
audioinchannels
audiooutchannels
audiobuf

etc.

Any ideas?

@whale-av Care to share for future readers?

I haven't looked at midi settings yet, and I will look at writing audio settings soon, but here is a tiny simple patch that grabs all of the audio settings into a useful format without having to manually open the "Media" window...........
get_audio_settings.pd

This will drip feed slowly.....
Automatically change the samplerate of pd (live- while the patch is running) depending on the sample rate of the sound file (wav files only) that you are about to play.....
auto_samplerate.pd

Everything that I have found so far (for changing pd audiosettings "on the fly".
set_audio_parameters.pd