While checking the web for recent pricing information relating to ASAT III's, I came across this very cool video, in which the control setup on the ASAT III is held out as a relative standard. It's the most informative video I've seen on electronic modification. The way the guy set it up, pots outside, for hearing the differences is excellent. I'd say the host/ tech is a born educator.
http://www.planetz.com/?tag=gl-asat-iii