In case anyone is following my conversation with Roger Belton, I HAVE managed to get an Ipad to play music on my 20 Note MIDI Busker in place of the Palm m515 system I normally use.
To connect to the Ipad I got a USB adapter from Amazon
and to convert from USB to MIDI, I used https://www.amazon.co.uk/gp/product/B07KYDP3GK/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
The App I used is Midi File Player
It can take a few connections/re-connections to get all the hardware items to recognise each other, but they will do so eventually.