USB input, built in output

I'm working with a school who have just bought a roomful of 20" iMacs and a Sennheiser 136 USB headset for each machine. I know the headsets are not at all designed for recording or monitoring but the school decided on those for some reason so that's what they got.
My problem is this, using the USB adapter you can record from the headset mic but the level on the headphones is too low. I unplugged the headphones from the USB adapter and put that into the headphone jack. In the system prefs I can set the input to the USB headset and the output to built in output. This works fine in GarageBandand and photobooth but not in Logic. In the Logic audio preferences if I select the Sennheiser headset as the device I don't get any sound out of the headphones. If I select either the built in mic or built in input the headphones work fine. Unfortunately I can't just plug the mic jack into the iMacs as it is a line input and the headset needs the power from the USB for the mic.
Hope I'm not being too stupid and any suggestions are gratefully received.

So you'll have to setup an "Aggregate device" in the Audio Midi Setup of your Mac combinig the USB and the built in outs of your. Here is a link to a good description of how to do that:
http://support.apple.com/kb/HT1215

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