I have my MPK set up, so that when I've got the mixer selected my faders control the master volume of track 1, track 2 etc. etc. on fader 1, 2 etc. etc. So today I go to change the level of one of the devices, and the slider ain't doing fuck all. I start fucking about with it for about 10 minutes, then realise the problem. Somehow, the faders 5-8 on my MPK now control faders 1-4 on my mixer rack in Reason. Fuck know's what's happened there, any ideas? Last time I used it, they were working fine on the correct faders.