Not a prog rock album, but a journey enhancing the functionality of an old Hacker Autocrat RP33. Bluetooth module: www.amazon.co.uk/DollaTek-Blu... Mini Mod: www.instructables.com/AM-Radi...
Good question (which I should have answered in the video but forgot). I guessed at 560R in each channel to combine to the mono input of the audio amp and that seems to work.