On Tuesday, December 30, 2014 2:15:55 PM UTC-8, Phil Allison wrote:
whit3rd wrote:

3{a}. Square wave output for checking tone circuits and amplifier stability.

Or, maybe a white-noise output?


** Worse than your other mad ideas.

A/B switch, headphones, attenuator; it's not hard to check uncalibrated tone
controls that way. Or, with a math-equipped DSO, it can be quick to measure.

A real square wave has lots of bandwidth, beyond the important, audible, spectrum.