Booster

Essentials

The Audiotool Booster is a native companion app that runs the audio engine locally while you work in the browser.

It also hosts the Spitfire LABS plugin, enabling VST3 integration within Audiotool Studio.

Installation

Download and extract the zip file containing the .app file, based on your architecture (Intel or Apple Silicon).
Execute by double clicking the file

Note: Spitfire LABS is not supported on Linux.

The Booster is ready to connect when it looks like this:

A session in the Audiotool DAW will try to connect to the Booster on startup. If you already have the DAW open, reload the tab.

If the connection is successful, you can see the following icon in the bottom right of the DAW:

And the Booster will look like this:

Note that an instance of the Booster can only connect to one session at a time.

Latency Issues	You can potentially reduce general recording- and input latency by choosing the correct settings in the `Host`, `Device` and `Blocksize` dropdowns. The final latency is dependent on the `Actual Blocksize` shown in the Booster UI. The lowest and best latency is achieved with a block size of 128. Audio recording latency can be worse with the Booster than without, even with ideal block size and input latency correction. We’re working on this issue.
Booster not detected	The Booster can connect to at most one Audiotool DAW session at a time, and the DAW will only attempt connection on startup. If restarting the Booster and the DAW doesn’t help, please submit a bug report!
Linux Audio Issues	The Booster currently requires Jack, ALSA, or PulseAudio to be installed. The best latency is achieved with Jack. If you use PipeWire, you can use wrappers such as `pw-jack` or `pipewire-alsa`.
LABs plugin state synchronization	The LABs plugin state is synchronized between all clients in a multi-user session. However, the plugin is currently only audible on clients that have a connected Booster with the LABs plugin installed. This will be addressed in future updates - stay tuned!