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Straight speed changes can be accomplished in many audio editing apps, even the free Audacity. An "on-air" speed ramp like what you are talking about would have to be done ahead of time after a lot of conversation with the filmmakers using a DAW and then recording the affected audio off it for a playback dub. You cannot hook up the sync of a video camera to an audio device changing its speed (clock) with equipment normally available from rental houses--it would be a very custom rig (how much money do they have?). With normal gear you would playback the ramped track and they would shoot at a nominal frame rate (in video) and make the effect to match in post. In film there is more of a possibility of doing this on-set, but my guess is that the filmmakers would not like the lack of control and monitorability, and so would resort to separating the singer from the crowd via green screen and combining them later.
Philip Perkins
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