Knob On

Bring your Rack patch within reach. Map dials and sliders, get two-way feedback, and make precise changes from your iPhone or iPad. Requires a Mac.

Your Rack. Within reach.

Knob On turns your iPhone or iPad into a touch surface for VCV Rack on your Mac. Map a control to a Rack parameter, then turn or slide it from your screen. Changes made in Rack come back to the app.

YOUR TOUCH SURFACE [x] Eight dials on iPhone, or twelve on iPad. [x] Four sliders on both devices. [x] Hold a control to learn a target knob or slider in Rack. [x] See the mapped parameter name and its current value. [x] Choose labels, colors, and minimum and maximum touch ranges. [x] Use Fine mode to make dials and sliders adjust 10× more slowly.

CONNECT TO YOUR PATCH [x] Find nearby Rack instances on your local network. [x] Match the name shown on the Knob On Bridge module—no IP lookup needed. [x] Get two-way feedback while keeping your current touch gesture in control. [x] Save mappings in your Rack patch and keep your layout settings in the app. [x] Reconnect automatically when the connection returns.

BEFORE YOU START Requires VCV Rack 2.6.6 or later and Knob On Bridge 2.3.1 on a Mac with Apple silicon, on the same local network as your iPhone or iPad. Install the companion Rack module using the setup instructions on the support page.

Knob On controls Rack parameters. Audio runs in Rack on your Mac. Most standard bounded knobs and sliders can be mapped; internal CV modulation may affect the sound without changing the displayed parameter value.