I believe I have tried doing one track at a time a week or so back and the result was the same, I can try it again and report back. I see someone else has asked if I have given you sufficient info about my set-up, I had assumed that as you are described as PG staff you would have had sight of the Tech Query that I sent to tech support which described my setup in detail. So I run W7 on a HP Pavilion desktop about 8-10 yrs old with 8 MB ram running at about 2.3megh. I have Cubase pro9 2017, I run a Zoom R24 as an audio interface. My BIAB is 2021 purchased late DEc 2020 and with the 814? patch.