I have used this technique quite some time ago, at the very early time when the FPGASID was in beta stage. The FPGASID comes with a very unique feature, it is possible to disable the audio for certain voices. I have recorded a couple of SID tunes from the awesome artist Spino which I play occasionally while assembly/solder things in my videos. But to kick this topic even further, I've spent some time to figure out how to configure 2 FPGASIDs so that I get 3 separate channels for standard SID playback. By arranging these 3 channels in a normal 2 channel stereo setup, it is possible to achieve fantastic results. I'm really blown away about how some tunes now sound, it is a whole new experience. To make this approach a bit easier to accomplish, I will work on some additional hardware, so it will be compatible for standard 2 channel stereo setups.