If you can't beat em---
It seems to me that you have to start with an interface. My old Muse Receptor had some of these elements or scenes to assemble a song from many different sources. It is in beta now, but looks promising.
https://www.youtube.com/watch?v=HFKqMhRRORA
$19 ios


Edited by Bernie9 (12/21/18 03:32 AM)
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact