On Thu, Jun 14, 2018 at 4:07 PM, Neil wrote: > > Though I would prefer a pre-built device (as I'm on a very tight > schedule), I'm tagging this as EE in case anyone has a good circuit or > kit) for this. > > If you have an old Android, there looks to be voice changer apps on the play store, some advertise playback over headphones and not just for calling. I haven't used any but it would only take a few minutes to experiment. You could then cut the earbuds off a headset and wire an external amp. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .