Internal mic poor quality when recording in iMovie

I noticed exceptionally poor quality of internal mic when recording acoustic guitar piece on iMovie, with the built in iSight camera. Technically, the sound is called "Phasing" - it sounds like a slow 'whoosh' over all of the audio.
After investigation, I have found the cause to be the Ambient Noise Reduction algorithm added by Apple.
To remove this - go to:
System Preferences
Sound
Input
*uncheck* 'use ambient noise reduction'
Problem solved....
Now my question - does anyone know how to use the iSight (built in) and simultaneously and synchronously record audio using an External Mic - eg the Blue "Snowball" - which is a USB mic.
In theory, the mic should plug in and then show up as an external device, but when I select iSight camera as my video source - the Powerbook automatically assumes that I want to use the internal mic as my audio source.
Have tried to go to Sys Prefs and change 'Input' to USB - but no option to do so
All help appreciated
SK

Hi thanks for the response
unfortunately, it's got nothing to do with MIDI (which is just a series of controller information)
The Blue 'Snowball' External mic is essentially a 'USB Device' and should be recognised as such by the Mac. The data will come in as 16bit, 44.1khz AES bit stream and then be assigned a destination.
The problem is that iMovie does NOT allow me to separate the iSight camera from recording with 'internal mic'
I want a way of finding how to seperate them - and then assign the USB mic to be associated with the iSight camera - giving me iMovie/iSight videos - with PROFESSIONAL sound
sorry if i didn't make this clear
thanks again
sk

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