Connection status (port, controller, scripts, FL running) with setup hints; reconnect=True forces a re-probe.

Run Python inside FL Studio. Pre-imported: channels, mixer, plugins, transport, patterns, playlist, arrangement, general, ui, device, midi, utils. Set result to return a value; print() goes to output. Avoid time.sleep and looping plugins.nextPreset; pass midi.FFNEP_DontPromptName to findFirstNextEmptyPat.

List functions of an FL scripting module (empty = counts for all). Docs: docs/fl-api-reference.md.

Full project snapshot: title, tempo, time signature, transport, unsaved flag, channels, used mixer tracks with effects, patterns, markers. Call this first.

Save the project to its .flp (Ctrl+S via FL's transport command; an unsaved new project opens FL's Save dialog).

Set tempo (BPM) and/or time signature.

Undo N steps (negative = redo). save_point="name" instead creates a named undo point. FL applies undo with a short delay.

List arrangement markers; optionally add one at a bar (add_name + add_bar) or jump the playhead by jump markers (+1 next, -1 previous).

Fire any FL global transport command by FPT name: Save, SaveNew, Metronome, Loop, LoopRecord, Overdub, Snap, StepEdit, TapTempo, AddMarker, Punch, CountDown, NextWindow, Escape, Enter, F1..F12, Undo...

Write the MIDI notes played live in the last N seconds into the selected pattern (dump score log).

Transport control and status. action: play | pause | stop | record_on | record_off. loop_mode: song | pattern. speed: playback multiplier (1.0 normal). Call with no arguments for status only.

Move the playhead to a bar (1-based) or by delta_bars. FL applies it asynchronously; fl_transport confirms.

Play for seconds (0 = sample instantly without starting playback) and report mixer peaks and channel activity. The reliable way to confirm instruments make sound.

List channels: index, name, type, colour, volume, pan, pitch, mute, solo, selected, mixer track, plugin, MIDI port.

Edit a channel: volume 0-1 (0.8 = 0 dB), pan -1..1, pitch -1..1, colour 0xRRGGBB/'#rrggbb', select exclusively.

Read or write a channel's step grid in a pattern. steps: list of booleans (16 per bar). fill_every=N fills every Nth step instead. Omit both to read count steps.

Per-step values (melodic step sequencer): steps=[{step, pitch?, velocity?, pan?, release?, shift?, fine_pitch?, mod_x?, mod_y?}]; pitch = MIDI note, velocity/pan/shift 0-127, fine_pitch 0-240. Turns the step on.

Play a note on a channel now (preview only, not recorded).

Open/close a channel's plugin window (kind=plugin) or channel settings (kind=settings).

Utilities: quick-quantize the channel's notes; set its per-pattern step loop point (0 = off); flash a highlight around it in the channel rack.

List mixer tracks (named/used by default) with levels, mute/solo/arm, effects; plus master/selected indexes.

Edit a mixer track: volume 0-1 (0.8 = 0 dB), pan/stereo_separation -1..1, colour, mute/solo/arm, select, enable, bypass all slots, lock mute, polarity, swap L/R.

Route a track into another (send/bus) at level 0-1, disable a route, or list a track's routes (omit dest_track).

Built-in 3-band track EQ: band 0/1/2 = low/mid/high; values 0-1 (gain 0.5 = 0 dB). Omit values to read.

List a track's effect slots (omit slot) or edit one: dry/wet mix 0-1, mute, slot colour, focus its window.

Plugin at a channel (slot -1) or mixer track+slot: name, preset, param/preset counts, pad count.

List plugin parameters (index, name, normalised value, display string); filter by substring, page with offset.

Set plugin parameters: values = {"": 0-1, ...}.

Step to the next/previous preset (one step per call; FL loads it asynchronously and renames the channel).

Drum pad info (FPC etc.): semitone and colour per pad.

Discover named automatable parameters of a channel, mixer track, effect slot or global (offset, name, value, display). Address results later as raw_ or target id.

Channel settings knobs (arpeggiator, filter, echo delay time), normalised 0-1; omitted ones are read back.

Master volume, master pitch (0.5 = none) and global shuffle, normalised 0-1; omitted ones are read. Also reports the last-tweaked parameter.

List patterns (1-based): name, length in beats, colour, selected; groups; current pattern.

Create an empty pattern (no name prompt) or clone an existing one (clone_of), then name/size/colour it.

Edit a pattern: rename, resize (beats, 0 = auto), recolour, make current, clear all step-sequencer steps (FL's clearPattern opens a dialog, so steps only; notes via fl_notes_edit), bake per-channel loops.

List playlist tracks (1-based): name, colour, mute, solo, selected, activity; time selection; performance mode.

Edit a playlist track: rename, colour, mute, solo, select, lock mute; scroll the playlist to a bar.

Performance mode: read a track's live blocks/modes, or trigger/stop a block.

Show/hide/focus an FL window (mixer, channel_rack, playlist, piano_roll, browser, plugin_picker...). Omit window to list visibility/focus of all.

Send an action to the focused FL window through the API (no OS keyboard): enter, escape, yes, no, delete, insert, copy, cut, paste, up, down, left, right, next, previous, next_window, close_popup, close_all_windows, zoom_h, zoom_v (value = delta). Optionally focus a window first.

Read/set global options: snap mode (line, cell, none, step, half_step, beat, bar, events, markers...), snap on/off, step-edit mode, time display, step-sequencer swing 0-1; also reports metronome/precount/loop-record.

Show a message in FL Studio's hint bar.

Open the automation (event) editor for a channel parameter: volume, pan, pitch, filter_cut, filter_res, or p.

Forward a MIDI CC to the focused plugin window (for plugins that learn/respond to CCs).

Walk FL's Browser: list children of a folder path (empty = root), or with load=True activate the last item (a plugin under Plugin database opens in a new channel; a sample loads into the selected channel). preview=True auditions the current item. Reports 'stuck' when FL's browser selection does not move.

Queue notes for the open piano roll: [{midi, time, duration, velocity?, pan?, color?, slide?, porta?, fcut?, fres?, pitchofs?}] (beats; velocity 0-1). Applied by the FL Bridge Notes script; auto_trigger presses its hotkey only when FL Studio is already the active window.

Queue piano roll edits: clear | delete{notes:[{midi,time}]} | delete_where{filter} | set{filter,props} | transpose{filter,semitones} | shift{filter,beats} | scale_length{filter,factor} | quantize{filter,grid,strength,lengths} | humanize{filter,time,velocity,seed} | legato{filter,gap} | select{filter,selected} | markers{markers:[{time,name, kind?:time_signature|scale,tsnum,tsden,scale_root,scale_helper}]} | clear_markers. filter: midi_min/max, time_min/max, velocity_min/max, color, selected, muted.

Queue a piano roll marker: kind=scale (root + scale name, highlights in-scale keys) or kind=time_signature.

Last exported piano roll state (notes, markers, time signature, timeline selection) plus pending operations.

Write a multi-track MIDI file; dragging it into FL creates one channel per track (GM sound) with markers. tracks: [{name, channel 0-15 (9 = drums), program 0-127, notes: [{midi, time, duration, velocity}]}]; markers: [{time, text}]. Times in beats.

Music theory lookup: notes of a scale (scale_root + scale; modes, pentatonics, Indian thaats bhairavi, bhairav, kafi, yaman, khamaj, asavari), notes of a chord symbol (Dm, Bbmaj7, A7, C/E), or the name of a MIDI note.

Chord progression -> note list for fl_notes_add or fl_write_midi_file. style: block | arpeggio_8 | arpeggio_16 | broken; adds a root bass line when bass_octave is set.

Built-in drum patterns (keherwa, keherwa_dholak, dadra, bhangra, four_on_floor, trap, boom_bap, reggaeton) or custom JSON {"voice": "x..x"}; with channel_map {voice: channel index} writes them into the step sequencer. No arguments = list patterns.

Install an Edison audio script (Settings/Audio scripts/FL Bridge/.pyscript) from a template (normalize, gain, reverse, trim_to_selection, tone, fade, regions_every_beat) or raw enveditor code; run it in Edison via Tools > Scripts. No name = list templates. open_on_track opens Edison on that mixer track.

No arguments: which internal FL modules import from the controller context (flrack = add channels/load assets). With module (+ name): signature, docstring and members for use through fl_exec.