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Tips for using the Valeton GP-200 guitar multieffects unit as an audio interface on Windows 11 and Linux (Ubuntu)

Device is not seen by Valeton GP-200 Windows desktop app

First, check that you have installed the latest ASIO audio driver and the latest version of the GP-200 app.

Set USB Mode to Normal.

Then, go to the Global settings on the interface itself, and check that USB Mode is set to “Normal”, not “Legacy”

Valeton GP-200 is quiet under Linux but loud under Windows 10/11

(Install and) Alsamixer.

Use F6 to select the GP-200 audio device.

Maximise all volume sliders.

Set all three volume levels to max.

To fix the new settings across reboots, while alsamixer is still open, type the following in another terminal window:

sudo alsactl store

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