Famisound is a sound simulator of the retro game hardware.
It can play the sound by operating a virtual register by a standard controls of iOS.

[Toolbar buttons]
[Play button] - Play the sound
[Pause button] - Stop the sound
[Reset button] - Reset the settings to the default

[Settings]
[Pulse wave channel 0 and 1]
[Enable] - (ON/OFF)
[Loop] - (ON/OFF)
[Duty] - (12.5%/25%/50%/75%)
[Decay] - (ON/OFF)
[Power] - Decay speed (if [Decay] is on) or volume of the sound (if [Decay] is off)
[Sweep] - (ON/OFF)
[Direction] - (Down/Up)
[Delay] - Delay of the sweep speed
[Detail] - Detail of the sweep
[Length] - Length of the sound
[Hz] - Frequency of the wave

[Triangle wave channel]
[Enable] - (ON/OFF)
[Loop] - (ON/OFF)
[Counter] - Counter of the stop the sound
[Length] - Length of the sound
[Hz] - Frequency of the wave

[Noise channel]
[Enable] - (ON/OFF)
[Loop] - (ON/OFF)
[Decay] - (ON/OFF)
[Power] - Decay speed (if [Decay] is on) or volume of the sound (if [Decay] is off)
[Type] - (Long/Short)
[Length] - Length of the sound
[Hz] - Frequency of the wave

[Note]
* DPCM channel is not supported.
* It is neither musical instrument nor the composition tool.
* It doesn't have the recording function.
* When the sound was played, the delay is slightly generated. But this is due to the specification of hardware.