Duet works, thank you. I’d forgotten I’d bought it a few years back.
The config I’ve settled on is as follows:
- Duet to extend my main MacBook display to my iPhone via a cable
- Amphetamine on MacBook to stop the (iPhone) display turning off when I close the MacBook lid
- GP Selector extension to provide an iPhone-size screen optimised display of songs and song parts
- Hardware buttons on Arturia Keylab mapped to Song and Song Part (Previous & Next).