Quicktime and Audio inputs.

Hi everyone,
thanks for your time.
I need to record some fast videos with my macbook pro and I want to use Quicktime because it is really fast and easy to use.
This is the problem.
When I start to record a new video and I select my "Focusrite Pro 24DSP" as main audio interface, Quicktime records only inputs 1 - 2.
How can I choose other inputs, like 15 - 16 (where it is the loopback function), or simply record the Mix Out?
I need to record my keyboard along with some songs on iTunes.
I tried to go into the audio preference, but I can't do anything for the inputs. I am asking if with another audio interface, like an Apogee duet maybe, I can resolve this problem (I can select which channel to record! 1, 2, 3, 4... or the DAW, or MIX L - R).
I could do this with my windows XP and with a 30$ USB interface (I could select the mix as record input from the audio preferences).
Why can't I do it with a 1500$ Macbook?
I don't want to use Logic Pro for this (it works good): I need a fast video - audio record, but I just have to record the complete mix (L - R), not only 1 - 2 inputs.
I hope that everything is clear!
Thanks for your help,
Marco

I just did my first feed Monday night. I used a video mixer and Mackie board myself. I feed the audio and video(component) into my DSR-20 VCR, which I also use for a tape backup recording. This then feeds the QT Broadcaster. I don't think you can feed anything but a firewire machine or iPhoto camera into Broadcaster. Might work with an USB camera/vcr???
I feed H.264 video, at 320x240 with mono 16 bit audio. Hint... don't do disolves, as they increase the frame rate. simple cuts-only seems to be the best. We also fed keynote slideshow into switcher... carefull there, as it produces saturated colors that will effect the signal... the switcher will think the super saturated video is sync and glitch the video. red is the worst, of course. Next week I am going to use a little proc amp to drop the chroma a bit.
G5 Mac OS X (10.4.8) Dual 2.5, PPC, 2.5 Gig Ram

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Quicktime and Audio inputs.

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