Flanging sound on only 1 midi device

[quaz]

Midi set-up:
Alesis DR-Pro midi drum-set
Korg Triton rack
Roland A-30 controller

into Motu midi express XT
via usb into Mac

Local control is turned off of Dr-Pro and Triton.
I get flanging sound only on dr-pro kit when I record enable in protools Le 5.1. When it's not record enabled it sounds how it should.
Why do I hear Dr-Pro kit when it's not record enabled? I shouldn't hear anything
(except for during playback).

Also, no matter how I set-up OMS, when I add a new device to Midi express, it says a-30 = device 0, triton = device 0, dr-pro = device 1
Triton = device 0.
Shouldn't it be device 0,1,2?

Thanks

[Ben Jenssen]

Perhaps the "Monitor" button on DIGI001?