Multiple Tone Generator

This app generates the audio signal of multiple channels.
Supports 6 audio channels by default, upgradeable to 16 via in-app purchase.

[ Wave type ]
- There are four types of waveform. (Sine, Triangle, Squire, Saw)
- It can switch to the four types of each waveform by the wave type button.
- It can be set for each channel.
- It can change summarizes the waveforms of all channels with the bottom of the button.

[ Volume ]
- It can adjust the volume of each channel (Input) and change the mixer (Output) of all channels by the volume slider.
- It can be set OFF / ON the volume of each channel by mute button.

[ Frequency ]
- It can set the value of the frequency in 20Hz - 20000Hz.
- It can set the frequency value in the software keyboard by tapping the frequency label.
- It can set the frequency value at the corresponding slider to the logarithm.
- It can set the frequency value of -1 / + 1 octave from the current value by -1/+1 Octave button.
- It can adjust the frequency value slightly from the current value by -/+ button.

[ Preset ]
- It can set the frequency value of Guitar (E A D G B E), 6-string bass (B E A D G C) for Ch 1 ~ 6.

Guitar :
 Ch 1: E ( 82.4 Hz)
 Ch 2: A (110.0 Hz)
 Ch 3: D (146.8 Hz)
 Ch 4: G (196.0 Hz)
 Ch 5: B (246.9 Hz)
 Ch 6: E (329.6 Hz)

6-string bass (+ 1 octave) :
 Ch 1: B ( 61.7 Hz)
 Ch 2: E ( 82.4 Hz)
 Ch 3: A (110.0 Hz)
 Ch 4: D (146.8 Hz)
 Ch 5: G (196.0 Hz)
 Ch 6: C (262.0 Hz)