Not only does new website, http://hackingthepo.weebly.com, let you in on a secret of what the actual parts used are and where they are located, but there’s useful info on how the pads are mapped, the LED waveforms, keys and pots, and data on the PO-12, PO-14 and PO-16’s display and the elements that are mapped to it.
Basically, it’s the site you’ll want to visit should you wish ti hack one of the original Pocket Operators, or have a head start hacking the three newer ones.
Be warned this isn't a "step-by-step tutorial" website on how to hack the PO, rather a "here's the info, do what you will with it."
PO-10, PO-12, PO-14 review: https://ask.audio/articles/review-teenage-engineering-pocket-operator-synths
PO-20, PO-24, PO-26 review: https://ask.audio/articles/review-teenage-engineering-po-20-po-24-po-28-pocket-operators
Teenage Engineering website: https://www.teenageengineering.com