Hard to say, fun to play Stochasticizer MIDI Sequencer JSFX plugin for REAPER
Stochasticizer MIDI Sequencer is a free plugin for REAPER that plays your selected notes semi-randomly. It works in Mono or Polyphonic modes and can save 8 patterns.
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Download the JSFX
Install to your REAPER Effects/MIDI subfolder.
save as
To use, insert before a virtual instrument on track fX chain.
Enter notes on the 16 step grid. Sequencer runs with project transport