What you are asking for has been talked about at length before. The problem is that RTs are not midi based, nor are they note based. We already have note based audio for midi it is called samples. These are individual notes of audio samples that are velocity layered for midi to trigger.

RT's are full 3 to 5 minute wave files of live audio musc chopped up by the bar and regenerated to fit the bar, chord, and tempo of the song. If you were to chop them all the way down to the individual note level they would be no better than sampled notes. Even if you only triggered then by midi and not to follow midi velocity, bend commands, and such they would never sound quite right.

Who know that technology might come along someday, but it is not here yet or someone would have already tried it.

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