I know I'm too late to the game, but here is what I wish I could have written 4 years ago..., and maybe it will inspire an upcoming cartridge or rev 2.
In addition to SIDS and digital audio, add Memory Addressable Analog Filters at the Audio Output Stage.
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To me as a musician, the soul of the Commodore was the sound. It's what drew me in. Lately I've been learning about SID chips and the unique fact that they had analog filters. I keep reading that the analog filters on SID chips can't be recreated, so don't try. Ok, I get that.
Currently, the Mega65 will have 4 soft sids, 4 channels of digital audio, and the ability to have hard sids in a cartridge, thus the Mega65 will be able to emulate the sound of the past, and also do a lot more.
But the Mega65 could also be given a soul of it's own. A new soul that inspires musicians to create. It is the next Commodore. It could have it's own analog filters. It could become it's own thing.
Take a lesson learned by every modern synthesizer maker today. You can digitize everything, but then stick an analog filter at the output stage and you bring things to life.
Add Memory Addressable Analog Filters at the final Audio Output Stage after the soft sids and after the digital audio.
Yes, this is not meant to emulate the old, but musicians will use the Mega65 to create brilliant music. Imagine the new demo scene with sweeping filters. Yes, these filters are not per Sid voice. Instead they operate like a Moog Model D... where audio is mixed into the filters after the sids and digital audio
strumm