Phosphor Keys

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

Envelope, reverb, master volume, wave, SoundFont preset — ready to paste into SampleSynthEngineOptions

Sound source Oscillator fallback

SoundFont (.sf2)

Drop or choose .sf2
Not loaded — drop a .sf2 once; it is cached for later visits

Preset

Fallback wave

Master volume

Reverb wet mix

Reverb tail

MIDI (.mid)

Drop a .mid once — cached for later visits

0:00 / 0:00

No MIDI file.

Active

Envelope source

Output · scope

OUTPUT · SCOPE

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