It's a keyboard!
You can pick the type of wave you want, then use your keyboard to type
Black keys: w
e
t
y
u
o
p
White keys: a
s
d
f
g
h
j
k
l
;
'
Octave Up: 'x'
Octave Down: 'z'
npm install
npm start
See REACT_README.md for more