The confection of the Latin- and Jazz-backings is in essence a proces of reverse engeneering.
The idea is to construct backing patterns.
The patterns are extracted from existing MIDI -files. Sources are :
I extract the necessary patterns and reassemble them into
MIDI-sequences with the appropriate chord changes, that can be found in
Real Books, for example.
The backing is ready by now, and if a finishing touch is necessary, I use Anvil Studio.
Finally, the Midi sequences are injected into Tabledit, on top of which I add the melody, and edit the lead sheets.