Developer's DescriptionBy XYZ-AppsFree Signal / Tone / Frequency Generator...Free Signal / Tone / Frequency GeneratorFeatures- Multiple waveforms- Smooth amplitude and frequency control- Background operation- Output via audio jack- Frequency range configurable via settings pageWaveforms- Sine- Triangle- Sawtooth- Square- NoiseTo change the range of the frequency slider, press the settings button at the top-right corner.