How To Select One Video Feed During A Conference

I have a need to conference with three people and show them a single video presentation. I only need to hear their audio feeds, I do not need to see their video, and they do not need to see each other.
I thought it was possible in iChat to select which of the two conference windows would be full screen. But I don't seem to be able to find a way to do this.
To be clear –
I have a video which is essentially my video feed.
I need to have two different people in two different locations see it at the same time
I need to be able to hear their comments.
I don not need to see them, and they do not need to see each other.
When the screen is split into two windows at an angle, the quality of the video I am sending degrades and the the forced presentation perspective makes the picture even harder to see. Also, there is no reason to tie up the bandwidth with video feeds from my collegues. The ONLY need to see the video, not each other. We all only need to hear each other (my audio is run throug a mixer so I can send video audio as well as my voice).
I thought about trying a video/audio conference, but can't figure out how to invite them to a video chat if they are both audio only. I did mangae to get one of them online as audio only, but it still created the same presentation screen only with a static placeholder where the video would normally be for one of them.
Is there any way to do what I want, i.e. share a single video source with multiple people in full screen, and enable two way audio with all parties at the same time?

Hi,
I thought about trying a video/audio conference, but can't figure out how to invite them to a video chat if they are both audio only. ...
This can be done if the Buddy goes to the Video menu and Disables the Camera (or Video chat if Lion).
However you are right in that iChat presumes there will be video and still places the place holder for that "Video"
I must admit to not having tried this with two Audio Only Buddies whilst sending Video myself.
Logic says it should be possible.
iChat does base the video quality on what it can manage.
This is based on your upload speed and that (download) of the Buddies.
(one Buddy can slow thing up to an extent that in 3 and 4 way chats the Video will drop off - normally the last person added)
If you can get One Way Video with two Audio Only Buddies the Bandwidth issue should not raise it's head.
However things to try:-
In iChat Menu > Preferences > Video section set the Bandwidth Drop down to 1Mbps (Also try it at 500kbps)
The 500kbps is high enough for 3 and 4 way full on Video chats but you may have issues if the Streamed Video is more detailed than the 640 X 480 pixels for ichat Best rate in iChat 5 (720 X 480 in iChat 6). AT this point you lose out to iChat trying to process the Video.
Strangely the Yahoo App for Mac does exactly what you want. (At least in one to one chats)
It deals with Video as a Stream that others can then look at whilst Audio is more like ichat in that it is Buddy to Buddy.
I don't have enough Buddies in Yahoo (And using the Yahoo App to test this further.
9:28 PM Thursday; February 9, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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