Hum caused by Launchpad?!?!?!

[vorbis]

Hi guys, having a strange issue with Ableton & Launchpad

When I have my Launchpad plugged in and a Live Set open, I'm getting a hum through my monitors when it is in 'Session' & 'Mixer' modes.
The hum seems to be at a different frequency in each mode and intensifies the more tracks are added.

It disappears when Launchpad is disconnected so it's definately something to do with it.

I've taken apart my setup, and put it together again making sure no cables cross and changed the USB cable that was supplied.

Anyone had the same or similar problem?

Cheers
Simon

[chapelier fou]

bumping this cause i am having the same issue.
it doesn't bother me as i only use user1 and 2 modes, but it's strange though.