Using 2 SEM in a split keyboard causes one of them to be silent

Lab AstroLab
#1

Using 2 SEM in a split keyboard causes one of them to be silent. Eg trying to set up I’m Lucky by Joan Armatrading. Any advice how to fix that?

Cheers
Pete

#2

Again, not able to reproduce this with firmware 1.4.4
Do you have examples?

#3

Thanks for testing Sean. I’ll post a short video when I get home