Solved.

I didnt realize having the "note length" of the arp set to the highest setting would cause this but sure enough that was it. If anyone else comes across this, insure your Note Length is below maximum value.

@trillbilly said in Arp Note Length:

Hey Gang,
Im creating a drum plugin with randomization to an arp. All is working well except the Note Length. If I set them to 100 & then randomize the Step Count, they then go back to the default.

Can the Arp Note Length be set to 100 at all times?

You can (re)set the Note Length in your Step Count callback.