Multiple Tone Generator

This app generates the audio signal of 6 channels.

[Features]
- There are 4 types of waveform. (Sine, Triangle, Squire, Saw)
- It can adjust the volume of each channel (Input) and set OFF / ON that, and can change the 6-channel mixer volume the (Output) in the bottom of the slider.
- It can set the value of the frequency in 20Hz - 20000Hz.
- It can tap the frequency value text to edit the value.
- In -1 / + 1 Octave button, it can set the frequency value of -1 / + 1 octave from the current value.
- In the Preset button (Guitar, Bass), it can set the frequency value of Guitar (E A D G B E), 6-string bass (B E A D G C).