iPhone browsers can't go fullscreen from a button. For the full-screen app, tap the Share icon, then Add to Home Screen — SLOOP opens with no browser bars.
GOT ITORBIT 0.4.1: the actual FM-1 firmware compiled to WebAssembly. HOME edits note and drum events; it is not an audio tape recorder.
Twelve original presets begin the PRESETS list. SWARM layers six detuned oscillators; PULSE combines dual pulse oscillators and PWM; FM4 provides four operators and three routes. These are independent implementations, not OP-1 factory sounds.
Stop playback. Hold HOME, turn SELECT to SYSTEM, scroll PRESETS to DEMO SONG, then press OCT+ twice and PLAY. OCT− cancels the first confirmation. This loads a four-bar loop at 108 BPM with FM4 bass, SWARM chords, PULSE melody and 808 drums. Save your work first: loading replaces the working project, including its normal autosave. Numbered project slots remain untouched.
LFO SOURCE 1/2 sets RATE, WAVE, PHS and FADE. Press LFO again for DEST 2/2: PIT, FLT, SHP and AMP depths. Zero depths mean no sound change. For an obvious effect, set DEST KNOB4 / AMP to about 50%, then adjust SOURCE RATE while holding a note. PHS and FADE affect a new phrase: release all keys and retrigger. SHP modulates harmonic balance in SWARM, pulse width in PULSE and FM depth in FM4.
KNOB1 sets the head; KNOB2/3 set the inclusive region; KNOB4 chooses COPY or LIFT. OCT− copies or lifts; OCT+ drops at the head and overwrites destination events. ALGORITHM selects the track.
Synth: EDIT. Drum: select track 4, then EDIT. Event Tape: HOME. Mixer: GLO on the Tape. Sound modules T1–T4 are EDIT / ENV / FX / LFO. The four controls are blue / green / white / orange; repeated presses keep the existing parameter pages.
KNOB1–4 adjust track 1–4 levels. SELECT opens four-track PAN, then TRACK: global SWING / selected-track LEVEL / LEN / PAN. Press GLO again for global settings. SEQ opens the retained step sequencer.
Browser flash saves locally, separately for ORBIT. Bluetooth, USB/SysEx sample upload and hardware boot checks are not supported by this emulator. Do not enter hardware calibration.
ORBIT source, screenshots and progress · forked emulator: sabliran/sloop-web-emu.
SLOOP is a four-track groovebox: three synth tracks and a drum track, a 64-step sequencer, songs and punch-in effects. The golden rule: hold a function button and the 16 white keys and four knobs change job — the screen always shows what they do. Tap the same button instead to open its pages; hold a layer and tap HOME to lock it open.
| HOLD | THE 16 WHITE KEYS | KNOBS 1 · 2 · 3 · 4 |
|---|---|---|
| FX | 16 punch-in effects on the whole mix — loops 1/4–1/32, stutter, reverse, tape stop, half speed, filter sweeps, phone, bit crush, alias, gate, echo, tape wobble | FILTER · DUST · DUCK |
| EDIT | erase a sound or note as the loop plays (stopped: from the whole pattern) | SHIFT · LENGTH ×2/½ · TRANSPOSE |
| ARP | note repeat on the grid, recorded as ratchets | RATE 1/8 … 1/64 |
| SEQ | the 16 steps of the page (black keys switch pages) — tap an empty step to set it, a set step clears when released; hold a step and turn a knob for its level or ratchet | SOUND/NOTE · DIV · SWING · LENGTH |
| SCL | any key sets the key of the song | CHORD · SCALE · KEYS · TRANSPOSE |
| GLO | keys 1–4 mute · 5–8 solo · key 16 tap tempo | LEVELS OF TRACKS 1–4 |
| SAVE | keys 1–4 play sections A–D on the next bar · 5–8 save the loop into them · 13 loop/song · 14 record the song · 16 the chain | — |
16 drum sounds on the white keys, kick to cowbell; a black key doubles its left neighbour for fast rolls. Hold OCT−/OCT+ while playing for ghost and hard hits. 37 kits on the PRESETS knob — a sampled acoustic kit and 32 synthesized styles: 808, 909, trap, house, jungle, chiptune and more.
Nine engines — analog, 4-op FM, phase distortion, trio, organ, voice, granular, lo-fi chip, sampler. 68 level-matched factory sounds browsed by kind, 32 user slots. One-key chords in SCL: TRIAD, 7TH, 9TH, SUS4, POWER. Envelope and LFO pages under ENV and LFO.
Save up to four sections A–D (SAVE + keys 5–8), launch them live on the next bar (SAVE + keys 1–4), and record the arrangement as you play it (SAVE + key 14). In song mode, PLAY runs the whole chain.
Condensed from the project's own documentation — full manual: SLOOP on GitHub (README & SLOOP.md).
Felucca is a multi-engine synthesizer: four tracks with an engine and sound each, thirteen engines, a 64-step sequencer with chords, chance and motion recording, and a modulation matrix. Navigation: tap a page button for its page, tap again for the next; HOME returns home. On action pages and in dialogs, OCT+ confirms and OCT− goes back.
64 steps per track with chords, ties, accent, slide and per-step chance; a piano-roll view; a drum grid — white keys are steps, black keys are lanes; motion recording of knob moves, marked by a motion icon on the cards it drives; divisions from 4 bars to 1/32. Loading a sound never touches your patterns.
ANALOG two osc + noise, resonant low-pass · FM6 6-operator FM, 32 algorithms (Dexed-based) · PHASE phase distortion · LOFI chiptune with 4-bit wave RAM · SAMPLE multisamples + user slots · VOICE formant vowels · TRIO 3 osc, ring mod, sync · WHEEL tonewheel organ with rotary · GRAIN granular · PHYS modal resonators, strings, membranes · NOISE analog to digital noises · DRUM the drum engine.
Per track: distortion and slicer; sends to chorus, delay and reverb (ROOM or SPRING); a modulation matrix with 4 slots per track.
PRESETS moves through the rows, KNOB 1 or OCT+ changes the value, hold HOME again to leave. Highlights: COLOR (ten palettes incl. PAPER, NIGHT, HI-CON), STYLE FLAT/LINE, LARGE tall knob cards, LEDS, KNOB ACCEL, FX LATCH, BPM LOCK.
Condensed from the project's own documentation — full manual: Felucca on GitHub.