Filament

Subtractive keyboard

Octave

C3

Scope

Tap a key to start audio

Standby

Waveform

C3Z

S

D3X

D

E3C

F3V

G

G3B

H

A3N

J

B3M

C4Q

2

D4W

3

E4E

F4R

5

G4T

6

A4Y

7

B4U

C5I

Bottom letters play the low octave, the Q row continues up. [ and ] shift octave. Hold space to sustain. Sound stays off until you touch a key.