If anyone would like to know how to do the new late-2017 firmware & jumper sound mod for the Gotek drive, along with some other Commodore Amiga repair goodies, here it is!
https://youtu.be/KE2-VC6FIFM
Starglider aka ԹҽɾíƒɾɑϲԵíϲ
www.youtube.com/perifractic