I'm back and after 20 minutes of messin with it, I can tell you the Drag and Drop works fine.

But that is 20 minutes i will never get back. I first rebooted the PC. No joy still no sound on the dragged and dropped wav files. I opened them in Reaper and dispite the fact the file was 33Mb there was no wav form visible. I did take notice of an unusual message about "the render of midi was successful...", but this is entirely RTs and wav??

Went back to BIAB and tried my old trusted and true workflow of just dragging to Reaper. No joy, same thing as the other workflow.

I next hit return to factory setting (RTFS). Hit the play and the BIAB play back was a mess. So I exited and reopened. Opened all the same files and This time it was magic.

So what do we tell Newbees?

BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6