Cubase 13 has made some changes on the midi transformers, therefore it is necessary a small fix in flow template to make it compatible. The issue introduced is that when you select a track in Cubase it is not correctly shown in Flow+.
for each cubase track you need to open the transformer in the midi send and change “Value 1” and “Value 2” with “Subtype” and “Main Value”
I will work on a new version compatible with Cubase 13 and make an upgrade of the project which will also include the inclusion of some Sine player libraries I have recently made and a few others.
But feel free to change it yourself.
Thanks to @evrim.leventler who has very quickly found the solution!