Pcp 7.0 Pi4 and USB Bluetooth

Hi all

OK, so I have no problem making my Pcp 7.0 install working to a bluetooth speaker using the internal Pi4 Bluetooth circuitry. however, as said by many, performance/range is poor due to the shared antennae with Wifi.

So, I want to use a bluetooth dongle.

I switch off the built in bluetooth, install a USB Bluetooth (CSR 4.0) dongle and try again.

The "bluetooth controller" will not switch on now...

Any ideas on what I might be doing silly ?

Thanks
Barry