I found a custom JS plug-in called RoundRobin Faker created by Youn back in 2007 that translates a single MIDI note into a "round robin" of sequential MIDI notes across a flexible range of MIDI notes that you define.

With this, it appears possible to do a DAW sampler-based approach in the following way:

1) Create the desired MIDI track in Reason by just entering the pitches without regard to timing, duration, or velocity
2) Bounce the track to audio
3) Slice the track up into a REX file with Recycle
4) Drag the REX file into NN-XT or Dr. Rex and they will map all the slices automatically across different notes in sequence
5) Rewire Reason as a slave to Reaper
6) Make an empty MIDI track with the RoundRobin Faker FX plug-in on it as an effect
7) Configure RoundRobin Faker to target the note range that Reason has used to contain the mapped slices
8) Connect a MIDI controller to the Reaper track, and tap the right single note - as defined in RoundRobin Faker (play it along with another track for the song so you can match the timing)

I haven't tried it yet, but if it worked as I imagined, the single note input into Reaper would become translated into into sequential notes that trigger the mapped NN-XT or Dr. Rex slices in the proper sequence.

Of course, this approach:
- is complicated - still easier to do it per the previous advice in this thread
- requires converting the MIDI track into audio
- necessitates buying Recycle and forces the use of REX-based slicing
- will only work on as many notes as the sampler will hold

Anybody have a way that eliminates some of these issues?
Anybody want to create custom code for a DAW that would do this in just MIDI?

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