I have not progressed to
simulating tube-amps or synths yet.. lack of time, netlists and
tube-models; it's low priority ATM.

i don't mind making the circuits (in oregano or whatever), but i don't have decent models of tubes or transformers, and am not sure how to easily work with them in oregano (it's been a while, be kind)... i do however have access to a lot of classic amp schematics (fender, marshall, vox etc) and don't mind spending time capturing them into oregano etc if it will help.

porl