I hate their presentation; can't go back and forth from page to page.
Anyway; looks to me like whoever is running this, plays the part on the keyboard provided and it plays the multiple instruments along with what you're playing, thus keeping in time with the conductor.
Quote:
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With InstrumentalEase, a musician controls a limitless number of simultaneous, individual musical lines, all while playing a standard musical keyboard.
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They say that it comes pre-loaded with your show's instrumentation that you need; all you do is plug in and play.
As far as stage "glitches", it also says in the presentation it can "Vamp and relocate on-the-fly"
Quote:
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If scenery gets caught or someone misses an entrance, you won't have to stop to react. Emergency vamps and relocates can be created seamlessly while the music continues.
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You'd probably do better going directly to their site at the end of the presentation and directing your questions to them.

Sounds like quite an interesting system.