Will it work in a Commodore 128?Yes, it will. The Commodore 128 has a 6581 or 8580, driven in a similar way to a Commodore 64. When ordering, go for the normal height (i.e. raised up by one socket height) version.
Will it work with a Commodore 64 Reloaded?Sort of. The power input to the Reloaded boards is 12V. This is filtered and fed to the SID, or can be fed via a 3V zener diode to give 9V for an 8581 SID. The normal dual SID boards have onboard voltage regulators to generate 9V and / or 12V for an unregulated DC of 15V or more, which is present inside the original Commodore machines.
Will it work with a Nano SwinSID?Yes. The Nano SwinSID can be used, but with a few caveats. Firstly, the board is a bit higher than a standard SID, so will cause height issues in a C64C. I could solder the Nano SwinSID directly to the board and reduce the height if required.
Can it be used as dual individual SIDs?Yes. The default setting is both SIDs are fed the same inputs and generate pseudo stereo effect. But, remove the CS#2 jumper and connect to one of the decoded IO lines on the cartridge port and if your software supports it, you can drive the two SID independently.
If you have any further questions, let me know, or see the previous article for more info and the buy it now links.