Phosphor Keys

Browser lab for @piano/soundfont — same SF2 / ADSR / voice-plan logic the app will share. Load a SoundFont, tweak envelopes, play MIDI.

Sound source Oscillator fallback

Drop or choose .sf2
Not loaded — oscillator fallback · last visit is restored automatically
Drop a .mid file
0:00 / 0:00
No MIDI file.

Volume envelope · ADSR custom

Active
OUTPUT · SCOPE

Keyboard tap · hold · latch · MIDI tiles

Tap to enable audio
Computer keys: C4 Scroll for more keys → · tiles: teal=melody track · amber=rhythm tracks · keys=melody only
Keys A W S E D F T G Y H U J K · Z/X octave · Space sustain. Load MIDI and press Play to see falling tiles.
Pure logic from @piano/soundfont · Web Audio adapter in lab only