Hi

> If I had a spectrum analyzer I'd figure my question out on my own..
> maybe I can find a spectrum analyzer online

If you have an oszilloscope which can take an external voltage for
horitzontal control, you can use the A-100 to behave as an poormans
spectrumanalyser:

Feed the signal to analyse through a vcf in bandpass mode and put it to
scope channel a.

Take a LFO with saw (ramp) as wave form and feed it to a multiple.

One connection from the multiple feeds the control voltage input of the
cutoff frequencyof the filter over the complete audiorange.

The other connection from the multiple is used as horizontal control of
the scope.

Done.

Florian