[sdiy] lowpass gate etc - the sounds of capacitors

[anthony]

I'm in the middle of making a dual lowpass gate like the Buchla 292C. I 
remember reading someone saying they'd made some each with different types 
of capacitors for different sounding filters. Before I finish them up and 
can listen for myself I was wondering just what different capacitors can be 
expected to sound like in different audio circuits. I think the impact of 
each different type might be different for the different uses for capacitors 
in audio circuits - like feedback networks or coupling caps or caps in a 
filter. In my circuits I'm using all polystyrene in one and a combo of 
polystyrene and silver/mica in the other. I had thought about using NP0's 
because I had this funny idea that they probably sound better than most any 
other ceramic. But then I decided that this was probably silliness and 
decided to not use any ceramics at all. Do ceramics really sound all that 
bad? I've never actually taking the time to compare the sounds of variosu 
capacitors. What would be the best kinds of circuits to use to test how 
capacitors sound? I've been wanting to make a headphone amp out of some 
medium-mu twin-triodes - maybe that'd be good.