First of all: Congrats for your great tool! It's exactly what I've been looking for.
But.... there is a kind of "misbehaviour" of Grapevine when using it with my "RME 96/8 PAD" audio card: In FLStudio (9.1), I configured 4 of the mixer channels to accept audio input (stereo) from the ADAT input of the card (4 x 2). In Grapevine, only the very 1st stereo "ADAT input channel" of the mixer is visible. The other 3 channels don't show up in the "channel list". Thus, sub-grouping of the 4 (stereo) channels is not possible. Does FL deal with "physical audio inputs" in a slightly different way? Hmmmm....
did you use the "Load track names from .flp" option?
that is a bit buggy.. i've had to reverse engineer the .flp format to get the mixer track names. if you could send and empty flp with those mixer settings i could look into why the names arent being loaded correctly