Mike Slinn

Multi-User Windows Support for RME TotalMix and ARC USB

Published 2025-07-24.
Time to read: 1 minutes.

This page is part of the av_studio collection.

TotalMix gets confused when a second Windows user logs in. Only one instance is allowed system-wide, but TotalMix attempts to launch each time a user logs in. This leads to misbehavior, because only one instance of TotalMix can control an RME audio interface at any given time. This is unfortunate, and inconsistent because TotalMix Remote can operate at the same time as TotalMix. Even worse, ARC/USB will misbehave for the second user, even if ARC/USB is plugged directly into the RME audio interface.

I want to prevent multiple instances of TotalMix running to avoid conflicts, and to ensure that an instance is always running.

Practicing Incantations

To store the full path of the RME TotalMix application for MADIface audio interfaces in a PowerShell variable called $exePath:

PowerShell
PS C:\Users\Mike Slinn> $exePath = `
  "$($env:ProgramFiles)/RME/MADIface/TotalMixFX_x64.exe"

To store the full pathname of the TotalMix executable for any RME audio interface in a PowerShell variable called $exePath:

PowerShell
PS C:\Users\Mike Slinn> $exePath = Get-ChildItem `
  -File `
  -Include "Totalmix*.exe" `
  -Path "$($env:ProgramFiles)\RME" `
  -Recurse

To start the TotalMix background process:

PowerShell
PS C:\Users\Mike Slinn> Start-Process $exePath

To stop the TotalMix background process:

PowerShell
PS C:\Users\Mike Slinn> $processName = `
  [System.IO.Path]::GetFileNameWithoutExtension($exePath)
PS C:\Users\Mike Slinn> Stop-Process ` $(Get-Process -Name $processName)
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