Automix
Crossfades that
wait for the bar.
OpenMix scores every pair, picks the trigger on an optimal bar boundary, and rides an equal-power S-curve while vocals are ducked out of each other's way. The groove never breaks.
Cella · OpenMix · macOS 15+
Your library,
mixed like
a live set.
Cella reads BPM, key, energy, and vocals on every track — then the OpenMix engine beat-matches the crossfades so nothing ever lands on top of a lyric. Drop a folder in. The desk does the rest.
Engine
OpenMix · Python
Chunks
5 s · 44.1 kHz
Buffer
3 ahead
Master bus · live
MIX 8A · 124.8 BPMEmotion · line stageSEAFOAM · 124.8 BPM
Peak Energy82% energy · live
BallisticsLIVE
L
R
M
BPM124.8
KEY8A
ENERGY82%
CrossfadeVOCAL-SAFE
Bar-quantizedT+2.0 s · equal-power S
Built for macOS 15 · Apple Silicon · SwiftUI + Python
OpenMix runs
the desk.
A Python engine analyzes and mixes in real time, streaming raw audio through a named pipe into a native Swift player. Every number it reads comes back to the screen.
Your .cella
folder drop
→
OpenMix
Python · analyze + score
→
Named pipe
float32 · 44.1 kHz
→
Swift
chunk player · 3 ahead
→
Out
EQ · reverb · limiter
A named pipe just means the engine hands audio straight to the player — 44.1 kHz, floating point, five-second chunks with three buffered ahead.
Crossfades that
Analysis
Every track,
read before it plays.
BPM, key, energy profile, bar timestamps, and vocal activity are computed and streamed back to the screen — so the mix and the light report the same numbers.
BPM124.8
KEY8A
VOCALactive · duck −6 dB
Emotion screen21:9
A dot-matrix mood display and a Catmull-Rom line visualizer — a smooth curve through the wave's peaks — breathe with the mix; artist art and video behind, lyrics overlaid, a green border pulsing whenever the engine takes a transition.
Two engines
Stream first.
Never miss a beat.
The main path plays OpenMix's freshly mixed chunks with three buffers ahead; a real-time AVAudioEngine path stands by with pitch, EQ, reverb, and a peak limiter. One glitch and the desk trades arms mid-bar.
STREAM — OpenMix chunks · 5 s · 3-buffer
FALLBACK — AVAudioEngine · EQ + reverb · limiter
More on
the desk.
A player, a lyrics lab, a boomerang maker, and a library format that keeps your folders yours — all four looks, four EQ curves, three keys to run it.
Your library
One folder.
Cella takes it from there.
Point at any playlist folder. Artwork and lyrics ride inside — Artist — Title.mp3 is parsed and matched automatically.
MIXSET.cella/
MIXSET.ca ← index
cma/ · album A/ · album B/
01 - Track.mp3
lrc/01 - Track.lrc
Looks · Ears
Four rooms.
Four curves.
Dark, light, seafoam, brat — with system or forced theme. EQ shapes tuned for the commonest cans, ten bands deep.
DARKLIGHTSEAFOAMBRAT
FlatBoseSonyAirPods Max
LabsLRC · Motion
Stamped lyrics,
looped moments.
An enhanced LRC editor slows playback to 0.25×–2×, taps timestamps into place, and keeps fifty steps of undo. The Motion lab turns any clip into a mark-based boomerang at 0.3, 0.5, 1, or 2 seconds.
LRC editor
0.25–2× · tap-stamp · undo 50
Motion
boomerang · 0.3/0.5/1/2 s
Keyboard
Three keys.
Full control.
- SpacePlay / pause
- ← →Skip · seek · next track
- LCycle lyrics