Should I build one if I don't compose any music? If I just want to listen to SID files using hardware instead of software or if I want to reproduce old songs thru MIDI should I build one? As for the other question I asked is: How do you make a 4 SID machine? I found you need 4 cores and 4 sid modules, but how do you control them? Different MIDI ports? Each SID have 4 channels on the 16 available? different IDs? I'm a newb to MIDIbox's way of working(MIOS with modules connected together and more modules you have, more powerful it is) so when someone talks about adding a AOUT module to the SID and adding a Moog filter I don't understand anything and I can't seem to find info on how to do that either. (I found that AOUT is a CV module but what's a CV?) And as for the K5, yes there are sounds really sounding like FM, but what I'd like the most would be to reproduce FM sounds easily, K5 programming is a real pain. If you want to see all the parameters for singles(multi are multiple singles at the time), go here: http://kfuenf.org/en/k5info.html#BASIC'>http://kfuenf.org/en/k5info.html#BASIC it's from How to program singles to the end of the page. The synth is really powerful(It's made in 1988 and more powerful than an XT running on it's 14 MHz NEC V40), but programming sounds is what made this synth so unpopular(~3000 units built) But, you can make songs like the ones on the kfuenf homepage http://kfuenf.org/ Also, there's just a little problem, I can't find a single commodore 64 available in canada on ebay, all the bids are shipping to US only.