I'm using BiaB 2012, with a Casio WK-500 using USB midi, I can record melody tracks with no problems, but when I try to use the pitch bend (set to +-2 semitones) while playing back a rhythm, it sounds and gets recorded very jittery, EG, when I move the wheel up or down slowly, I can hear the note bend, then return to initial note, IE, C down would sound the B note then immediately return to C or sometimes the bent note would stick and not return until the playback is stopped, but playing the note while bending when the rhythm is not playing I can hear the bend very smooth.

I'm using the CoolSoft virtual softsynth that uses the FluidR3_GM sound font, I'm not using any VST/DXi synths and because of the huge midi -> soft synth lag, I set the soft synth latency to 0, which stopped the midi lag. I even tried using the Casio on both midi in and out, the pitchbend is still jittery when recording a melody while a realtracks rhythm is being played back.

How do I stop BiaB from recording the pitch bend all jittery?