Reply to Dicers causing spike on Shift button

Hi!

I'm using FW 1.4 with 3.6.4 mapping on TP 1.2.7.

I recently bought the Dicers and am using DJTT's mapping.

Problem I'm having is when I hit the Shift button on my VCI, there's a spike and the sound lags/drops/skips/whatever.

I've tried changing the VCI's midi channel (pressing the FX Preset 1 while power up), tuning the performance settings in Win7, etc.. nothing so far beside unplugging the Dicers.

Also, checked that the mappings are assigned to each controller's port.

I've noticed that when I press the Shift button, the "CTRL" light in TP1 at the very top stays on significantly longer when the Dicers are plugged in, when they're unplugged, the light just flashes (like other buttons/signals) ..

Any ideas on how to isolate the problem?