Experiment with Tone.js, check out the code:
https://github.com/nevadajames/tonejs-experiment
Delay Time
Feedback
Wet
DISTORTION
PORTAMENTO
MOD INDEX
Hello Earthling
Oscillator Wave Type
Harmonicity
1/2
1:1
2:1
3:1
FM Synth Control
C2
D2
E2
F2
G2
A2
B2
C3
Synth Percussion
Kick
Snare
Conga
Bell
Pluck
Drum Loops
1
2
3
4