[chuck-users] Latency Vs Midi timings precision

Hi there, I am trying to synchronize my ChucK Loops and Synth with a friend. We use midi messages and I am Slave. I use Linux with Jack server. To ensure ChucK processing without glitches I play with latency (usually 186 ms). But I noticed that perdiodic midi messages are randomly delayed (kind of jitter of about 80ms) when received in ChucK. I also noticed that the jitter decrease when I reduce Latency. Latency is not a problem for me, and it is needed for Chuck to compute without glitches (XRun in Jack server). Do you know where the Jitter comes from (Linux, Jack, ChucK) ? Is there a solution to reduce it keeping some latency ? Happy Chucking, Julien