Audio Test Tone Generator 1.1.1

the author of this app says:

Real-time generated signals for sound engineers to test equipment.

Multiple wave forms: Sine, Triangle, Square and Sawtooth.
Custom frequency selection from 2 Hz to 20 kHz.
Frequency Sweep.
Noise: White, Pink & Brown.

Please get in touch if you have any problems, spot any bugs, have a feature request or need help.