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If you are up for the best performance and you don't want to dig into code: use both with two separate Cores. KB can't really handle LCD displays, pots und push buttons. On the other hand NG is not optimized for keyboard-scanning. The scanrate is a a lot (!) slower. And you will get a very low velocity resolution. Maybe 20 values out of 127 or so.

If you’re going to build an MB-6582, I’d suggest following the guide for Power supply option E. This uses a standard 12VDC wall wart and swaps out the 7805 for a switching regulator. Your synth will run very efficiently and barely give off any heat. You can completely ditch the fan. As far as lessons learned go, if you scan through the posts in this forum, you’ll see some areas I struggled with. Learning to program the PICs and change device, etc. took me a while, but it’s actually a pretty straight forward process. Getting the JB Weld ‘just right’ for the front panel takes some practice and patience as well. Everything you need is well documented and easily searchable, so look around and don’t hesitate to ask...