Free Software O-scope and Signal Generator
www.dazyweblabs.com

Totally cool free software scope- Definitely check it out! I haven't built the isolation circuit yet, just made my own probes using the voltage divider shown in their "Soundcard Tips" section. Ran the signal generator on an old k6-166/win95 and the scope with a faster machine under XP. Would be cool to line this data up with the simulation,

Below is my first REAL scope output data.(whoo- hoo!)

Wave-forms were created with the amp in the bloat position (R2=68k R6=1.4 C3=1u)
When switched to bright the preamp distortion is a bit less, wave-form is asymmetrical and cutoff is less pronounced roll-over below:

Below is some frequency analysis using more free software, I need to play around with this program a bit more looks promising.

Mouse over frequency.
Quick spectral test of the amp, again the amp was switched to bloat. Kind of cool to see this stuff!