Thanks for the reply Lloyd.

I'd tried most of what you suggested, but I've tried it all now. Full factory reset and a new song with just those two bars and it still sounds wrong. The first three beats are sort of OK, but there is something like a ghost beat that sounds around the fourth beat. As you say, the fourth beat should be silent.

I'm using the built-in sound card in my laptop and I have the coyoteWT VSTi/DXi Synth selected. This is the same as I had before upgrading to 2021 and it sounded fine then.

Andy Ling