Unfortunately there's currently no easy / plugin-and-play solution for this. However, you can call different scripts per dial rotation. You need to add 2 (or 3 if you also want a mute script) RunCommand actions to each dial and use the EventAssigner in the action config area (where you can specify the command) to configure when the action should trigger. This is not ideal, but it's a working workaround for now.

An alternative might be to use the VolumeMixer plugin, which now comes with dial support

Install the VolumeMixer plugin from the StreamController plugin store. It now includes native dial support for per-application volume control.

Setup

1. Open StreamController → Plugin Store
2. Install "VolumeMixer"
3. Drag the "Dial" action to each Stream Deck Plus dial
4. Each dial automatically controls a different active audio application

Usage

• Rotate: Adjust volume
• Press: Toggle mute
• Navigate: Use MoveLeft/MoveRight button actions to shift between applications

Limitation

Applications are auto-detected from PulseAudio in dynamic order. You cannot assign specific apps (e.g., "Spotify always on Dial 2").

Alternative: Fixed Application Assignment

For dedicated per-app control, use RunCommand actions with custom scripts:

1. Add 2 RunCommand actions per dial (volume up/down)
2. Configure each with a script targeting your specific app via pactl
3. Use EventAssigner to bind:
   • Clockwise rotation → volume up script
   • Counter-clockwise → volume down script

Example script snippet:

pactl set-sink-input-volume $(pactl list sink-inputs | grep -B 20 "Spotify" | grep "Sink Input" | cut -d'#' -f2) +5%

This requires scripting but gives you fixed dial assignments.