I have my MBA running audio out and USB out now, both are sending left and right info, how ever the USB sounds much better running into my peachtree audio amp. I used the aggregate device and added both outputs. The only problem that I run into is that I have to restart iTunes everyday to get the USB audio out to show up, but other then that it works great.
I found the Audio MIDI Setup as below;
-Audio MIDI Setup
Then you just click the + on the bottom right and select aggregate device and check the audio levels for each one.
Solved. (for me at least)
I found there is an update in the soundflowerbed code to 'clone' audio to all outputs.
Works great for me. ymvv.
I put up a page with instructions and background.
Hope it helps!
I use multiple instead of agregate and it works, but neither of these virtual devices let me control the volume and I need to control the volume of each output sources... from each ouitput souirce ! (an iMac and an HDMI screen)
PTHVolume lets me control the volume of the iMac but not of the HDMI screen.