I use a lot of the vst synth plug ins from K Brown. They all work in Bitwig and Waveform but only some of them work in Bespoke Synth. I have been googling why some vsts work and others don't but I can't find anything that comes anywhere near addressing that question. They all seem to be made the same way and are all vsts, do I can't think of why some would work and some not.
I also am just starting to program my own audio plugs and I plan on making some virtual instruments and I think this information will help me. I'm not asking for a too in-depth answer, just a short explanation that will point me in the right direction please.