I have recently acquired a used ADA MP-1. The unit is rather noisy and it has a faulty front input plug. These issue led to hours of research and discovery, including finding out about this mailing list and Mr. Kylheku (among other leading figures in the mp1 technical community)

** I'd love it if someone could help me debug and locate the source of the issue **

I have also put together a list of information and mods/upgrades/refurbishing instructions and other technical resources for the ADA MP-1: https://tinyurl.com/ada-mp1-refurbish-upgrades, feel free to check it out

Pilau