Audio Toolbox

Using no additional hardware, you can produce sine, square, triangle, and sawtooth waveforms of any frequency up to 22 kHz, as well as generate noise.

You can generate up to 13 different waveforms. Each waveform can be routed to either the left or right channel, or to both. The amplitude of each waveform may be adjusted, as well as the volume on each channel, which is a mix of any waveforms routed to that channel. In addition, there is a sweep generator. Audio Toolbox is useful both for testing audio/radio equipment, and for producing sound effects, as well as for tuning musical instruments.
What's new in this version:
Fixed a bug that could cause a crash when the Spectrum or Waterfall window is opened.