Problems with Scaler 1.5 in Bitwig 2.4

Hi, thanks for the additional details

Definitely VST3 issues.
Try to get Bitwig to find the VST2 version and the triggering issue will go away.
For the routing, there are different ways: Setup - Bitwig Studio 2 - External Instrument Control

It seems OK now in the 1.6, just tried it and couldn’t reproduce on Windows 10 - Bitiwig 2.4. Let me know if you experience it again and we will try to figure what is causing this.