I've been thinking of selling my A-100 System for a while now.  I'm having trouble getting around to doing it because I remember selling certain synthesizers on the past and then regretting it but I really think I want to do it this time.  I got it in early 2000's, I can't remember exactly when but it's in great shape.  The piece is really clean but there may be a few pots that have a little scratch in them but everything works perfectly.  To be honest I think I may really not have the knack for following electrical paths in order to get a good sound.  Not that I haven't gotten some great sounds but they were made with persistency rather than electrical knowledge.