Another fleeting thought; while I'm becoming ever so slightly stagnant with the uniform tempo protocol in the audio respect as there are inherent limitations and permanences imposed by homogenizing everything so draconianly, the MIDI plan seems to offer more flexibility to this premise. The plan is all MIDI patterns/sequences will be 100bmp, so as to make layering patterns on top of eachother catch-free. It's the global playback rate control in Reaper which would offer a breakout of this mid tempo hell. This also gets the wheels turning about plausible programming concepts for this sort of midi track layering in the project DAW; I currently know of no way to variably stretch or compress midi files in length, and even if I did there would likely be issues with the distorted variants as sample durations would elapse and no longer flow seamlessly. A rectification to this issue would be to shift the MIDI data down/up in pitch in relation to the percentage or degree to which the sequence was stretched automatically, meaning if a pattern was halftimed, it would translate the information down an octave.