RESOLVED
For the future time traveler:
The Tascam US-144 MK II control panel (that should have come installed with the drivers) should be set as follows:
- ch1 and ch2 -> analog inputs
- ch3 and ch4 -> digital inputs
- LINE OUTPUTS -> ch1 and ch2
- DIGITAL OUTPUTS -> ch3 and ch4
Reaper Audio device settings:
- Enable inputs
- first: 3 digital in L
- last: 4 digital in R
- Output range
- first: 1 analog out L
- last: 2 analog out R
Now i get audio from youtube and from reaper (havent tried at the same time). I still haven't figured out a way to direct monitor without going into reaper and enabling direct monitor on the armed for recorded track, but im so over this dasd;hgjlkhgjkas hkgjs hblkf