http://www.osxaudio.com/forums/viewtopic.php?t’68 I just tested this and it definitely occurs here: One stereo track, panned hard left; Multipressor on the master output. As soon as you insert the Multipressor the audio is now full stereo; the top two bands (in terms of frequency) are left channel only, bottom two bands appear in the right channel. Amazing, has this not been discussed before? To me it seems like a HUGE bug in the plugin, unless I'm missing something here... Brian :::::::::::::::::::::::::::::::::::: Logic Audio Pro 6.4.2 PowerMac G4 933MHz OS X 10.3.4 1 GB RAM MOTU 828mkII - driver v1.09 - CueMix v1.4