vArranger doesn't support this yet, but I will do it soon.

The Ketron SD2 does not support this.

I for now have included an intelligent algorithm to do the re-triggering smooth as possible...

Let me know witch VST do you want me to test.

The biggest problem with VST is the midi implementation yes....

Tons of VSTi are working on simply ONE midi channel, so it's not possible to use them on 2 tracks, or you need to load the VSTi 2 times...