Hi Graham,

I'm glad that did the trick!

This is a surprisingly common issue, I can't imagine why 5% is the default on so many machines. When I replaced my old 2010 MacBook Pro (Intel Core Duo processor, 4 GB of RAM) with a desktop featuring a 6-core i7 processor and 16 GB of RAM, I didn't see any improvement in audio performance, thought my MOTU interface was defective until I found this setting.

Cheers!
Kent
PG Music