Sampling the values doesn't have anything to with what you send. You can sample @ 10bit (which is what MIOS does) and scale to 14bits and send that. Or scale down to 7bits and send that. That's scaling and not interpolation btw. Obviously you can't send the 10/14bit value as a CC, but you certainly can send it as NRPN or SysEx. Not sure if/how that's implemented in the mb64 app, but you can certainly add it if it's not there. From a quick quick look at Serge's editor it seems that you can assign pitchbend to a fader which is 14 bits. Even if that's not exactly what you need, a few lines of code will certainly let you get the full 10bits to your DAW.