CC Sync controls how often MIDI CC knob changes are sampled and applied. Smaller values feel faster; larger values create beat-stepped motion. Timing uses MIDI BPM when synced, otherwise Manual BPM.
MIDI Device is the actual browser MIDI port. Controller Preset is only a mapping template; it does not overwrite active mappings unless you explicitly learn or apply mappings.
Browser-local instrument
uVJ renders your selected video in this browser tab. The file is not uploaded to AISOP.live, not sent to a backend, and not stored by the website.
No MIDI hardware nearby? Open the built-in sequencer or use number keys 0–9 after loading a video.
Timeline
Region
Regions choose when an effect happens. Press Select Region, then drag across the timeline to create or replace one active region.
Select or create a region.
Press Select Region, then drag across the timeline strip below the video.
Effects
Effects define how the video changes. Assign them globally, to regions, or through masks.
Select an effect, add it, then adjust strength and scope.
Select an effect.
Masks
Masks choose where an effect appears on the image.
Select a mask type, then adjust position, size, and softness.
Select a preset with masks or add a new mask.
MIDI
Mappings connect MIDI controls or sequencer events to video, effects, regions, and masks.
Mobile Performance
Smooth dense CC/knob streams before they hit the video renderer. Notes, pads, pitch bend, and pressure stay immediate.
Use Setup to choose a MIDI Device and a Controller Preset. Quick Learn now requires the same input 3 times before committing.
Quick Learn
Click Learn this on a single target, or start Auto Quick Learn. Repeat the same MIDI input 3 times to confirm each mapping.
MIDI Learn idle.
Select a mapping to edit its behavior and range.
Sequencer
Use the built-in sequencer when you do not have a MIDI controller connected. It emits the same note events as hardware MIDI.
Pick a BPM, enable steps, choose notes, then press play.
Select a step to edit its note and velocity.