It's a pity when a SID turns out to be broken.. When combining the two SID's you have to keep in mind that they have a different sound. It depends a bit on the way you want to use the sammichSID. If you want it to be dual-mono, I think it is not a problem and soundwise you even have more 'options'. But in stereo mode I would prefer the two SID's to sound as close as possible. Addition: If you are going to put in a 8580, be sure not to only switch the capacitors, but als make sure you r