Mixbus to Reaper via ReaRoute (SOLVED)

[Soulshade]

Hi everybody!
I want to route the master output of Harrison's Mixbus 8 into Reaper so i can master it, maintaining control of stem levels (in Mixbus). Essentially use Mixbus for its summing thingy.
Has anyone done it and can give me instructions on how to do it?
I used Rearoute in Mixbus as an ASIO input and output device, but its audio engine either won't start or if it starts there is no audio coming in to the track in Reaper (in which i assigned the corresponting input). Also Mixbus gets "glitchy".
I would be grateful for any help!

[Soulshade]

After hours of testing, just after starting this thread i found what i was doing wrong: I just had to press "ARM" in Reaper