GenX

This app is a simple substitute for a Function Generator.
It features:
Sine
Square (with variable Duty-Cycle)
Triangle
Sawtooth
AM
FM
waves at audio frequencies.
It is useful for testing amps, filters as well as doing some PWM testing.
Easy access controls on a friendly user interface make it a breeze to use.
There are slide bars for quick adjustment or you may type the value
for more precision. It also features nonstandard waves for a wider range of tests.

Whether you want to test equipment, test your hearing, or just
annoy people with high pitches GenX will do the trick.