Hi Felix! Single string vibrato is not a problem for MG2 if you have your pitch bend settings matched! Try it in standalone if you believe it is some issue with the DAW, but I assure you, you can get the MG2 software to follow your every (single string) vibrato in detail! It is the same vitae recorded vibrato. Look at these examples, where I have analyzed real recordings with the help of MIDI Guitar to get the most amount of detail out of it. The only thing I needed to focus on “fixing” is some appearances of extra notes due to reverb tails, echos or miscellaneous non intentional (spurious) notes generated:
But it is certainly not as easy as recording with a particular setting and, granted that works, expect a MIDI file to play all instruments flawlessly by virtue of having worked that one time. The next instrument perhaps doesn’t even use the same set of MIDI information to begin with, let alone the same pitch pend range (if even used at all).
The MOD wheel (CC1) can be assigned to use for pitch bend action for keyboard players, but what you are looking for is the actual registered pitch bend data set from the MIDI messages recorded. You can see (here in Logic) what it looks like, and where to find it. I don’t use reaper unfortunately.
There is nothing really special about the pitch bend part in a MIDI file, other than that it is not a MIDI CC per se, but is instead showing up elsewhere in the MIDI message data bundle. This is what it looks like in Abelton :
This is just a MIDI file recording, with no instrument opened. I moved the strings around little withPITCH BEND range set to 2. See if you can find anything like pitch bend in Reaper?