funini.com
自由研究
organ
HTML5 Organ
You can play music with your PC keyboard!
qwer... for upper octave
zxcv... for lower octave
16 ft
8 ft
5 1/3
4 ft
3 1/5
3 2/3 ft
2 2/7 ft
2 ft
Tremolo Hz
Tremolo Ratio