Welcome to tyhe forum.

You can set the volume by using the VR part of the ULF (BT module), Just push the button with the face on it. Wait for the Beep and say the word "volume up" till the right level.

If you don't have VR enabled, the get hold of KiwiJochen's navcoder and enable it.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.