Thanks for the good advice. It was actually simpler than that. My brand new Zoom must have been old stock, it just needed a driver update! Sorry for the unnecessary post, and thanks again for your reply Ollie

Anybody used the Zoom H4n Pro handy recorder as I/O audio interface? I' m running Windows 11 version 21H2, build 22000.856 on a DELL DESKTOP-LE0VDD2 with a 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz 2.42 GHz processor. It works fine with Audacity, Windows Media player, Chrome, Musescore. Pd recognises the H4 and will select is as input & output device, but no audio goes in or out. Any suggestions very welcome Ollie