1,300+ instruments, ready to play
An in-app browser pulls SF2 banks, SFZ libraries, and FM patches straight into your project for free. Every starter instrument runs through the harmonic link graph at floating-point precision.
GM-compatible soundfonts
GeneralUser GS, MuseScore General, FluidR3 GM, SGM. Complete General MIDI banks ready to play, with auditioning and one-click download from the in-app library.
SFZ libraries
VCSL, Karoryfer, Arbit Misc — orchestral, ethnic, electronic, percussion. Modern SFZ format with full velocity layering, round-robins, and articulation switching.
Microtonal playback
A patched sfizz engine accepts floating-point note values, so any soundfont pitches smoothly to any harmonic ratio — not just integer MIDI notes.
20,800+ FM presets
The DX7 .syx archive at your fingertips — bell, bass, lead, pad, arp, percussion. Drop a patch in, retune through the harmonic graph.
In-app store
Browse, audition, download. New libraries appear automatically as the catalog grows.
DiffSinger and UTAU voicebanks
Neural and concatenative vocal synthesis are Pro transformation features. Vocals retune to chord progressions like every other instrument.
480+ Airwindows effects, free in Arbit
Chris Johnson's Airwindows suite is built into Arbit Free — a complete library of console emulations, saturation, EQ, dynamics, reverbs, tape, modulation and more. Use them per-track, on buses, or on the master. No ports, no compromises — the same C++ Chris distributes as free VST/AU plugins. Alongside them, Arbit ships its own Donut Devices — the clean, tempo-synced, surgical utilities Airwindows intentionally skips (below).
Console emulations
Discrete summing models — Capacitor, ToTape, Console7 — that imprint analog character across the entire mix. Same Airwindows code top engineers use behind the desk.
Saturation & tone
Density, ToVinyl, IronOxide — vintage warmth, tape modeling, transformer color, all per-track.
EQ & filters
Surgical and musical EQs alongside vibe-driven tone shapers like Air, Bass, and Treble that can't be reproduced with stock parametric curves.
Dynamics
Compressors, limiters, expanders, gates — including the Pressure series for transparent leveling and the Logical series for surgical control.
Reverb & space
Bricasti, Cathedral, Hall, Reverb-1 through 4 — short rooms to infinite tails, designed to sit in a mix instead of swallowing it.
Per-track, per-sample, master
Drag-to-reorder effect chains anywhere they make sense — on a single sample, on the channel, on a group bus, or on the master. Native C++ throughout, zero plugin-format overhead.
Donut Devices — the clean utilities Airwindows leaves out
Airwindows is a character and coloration suite, and it deliberately avoids three things a default DAW gives you: clean, surgical effects; host-tempo sync; and visual-feedback dynamics. Donut Devices fill exactly those gaps — Arbit's own native effects, free, in their own "All Donuts" tab. No coloration agenda, just the clean tools a producer expects to be there.
Clean modulation
DonutChorus, DonutFlanger, and DonutPhaser — the standard, transparent modulation effects Airwindows only offers in deliberately "vibey" form. Quadrature LFOs, bipolar feedback, multi-stage allpass, stereo throughout.
Tempo-synced delay
DonutDelay is a ping-pong delay locked to host tempo — time set as a musical note division. Airwindows has zero tempo-aware delays; this is the one you reach for.
Clean dynamics
DonutLimiter (look-ahead brickwall), DonutGate (with sidechain key and hold), and a true SidechainCompressor for the classic kick-ducks-bass pump — each with gain-reduction readout.
Routing utilities
The boring-but-essential below-the-threshold tools: DCOffset, LatencyTrim (align parallel chains), ChannelSwap, PolarityInvert, and a standalone BitCrusher with optional TPDF dither. Native C++, drop-in anywhere in the chain.