Hmm.. Yeah, I might hit that as well. I'm going to be adding the bluetooth back into the circuit later today (i've been working with them separately for now). I'm using an HM-10, so I don't know if that'll act differently.
Thanks for the tip about the two nanos, that's actually what I've been thinking about given I don't want my main loop (which is driving a toy car) to be affected by having the audio of it's horn played back. 