hi sexiewasd,
for please join the discussion here: VidorDSP - MKRVIDOR4000 - Arduino Forum
as you will see we have ideas on how to handle audio even without adding external hardware...
regarding oscilloscope, i'll start a new thread as we were thinking to develop something a bit more complex than that with support for hardware triggers, protocol decoding etc, possibly compatible with sigrok (https://sigrok.org/). you may want to post your ideas about that here: Vidor as lab instrument - MKRVIDOR4000 - Arduino Forum
Cheers, Dario