@Martijn: Ah, okay! I got it! I will try that! Thank you!
Generally I should have mentioned what I was tryin to do: I wanted to use the SIP-Fuction like the solo-button in a DAW while working on a Band pre production with VSC. I just build a workaround with using the PAFL and patching my monitor speakers to the PAFL-Outputs of my dLive. Then it actually works like I was expecting the SIP-Function…
Anyway, thanks everybody for your comments, that was really helpful!