[Need some help] Monitoring through imput with Cubase/nuendo and RME totalmix...

[Mikaël-ange]

Need some help with it, my brain will blow
So long story short, for some practical reason I need to track guitars with impulses for monitoring but for some unknow reason I can't.
I run 2 tracks (1 DI tracks muted and 1 impulse scratch tracks) but I can't ear my gtr comming through impulse while tracking (only earing DI track)...

So how do you monitor through imput with impulse?

Ermin, Joey; feel free to add because I know you guys use a similar setup

Thanks in advance