Don't know if anyone will find this interesting or of any use... I haven't tried it yet, but thought it may interest some people:

SigJenny turns your PC into a flexible and powerful audio signal generator for free.

It can create multiple waveforms, sweep, fire single or repeating tone bursts. You can save your sound as a wav file, display a frequency response, use SigJenny a bit like an oscilloscope, and do a very good impression of a police car!


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