Re: Weird Juno-106 behavior
Crackly and some sounds without any key pressed: dead VCA chip 80017A for sure.
If you replace it, yes, it will be better. Until another of the other 5 chips dies. Which it will, eventually.
There is no real way to bypass this chip, as each voice is mixed in the signal path.
I supposed you could totally desolder the broken chips, and use the good ones for spaces 1-5 as mentioned before, and play in POly2 mode.
I use MKS-7's for replacements, for the time being.