Hi! Found two different ways to get MQA playing, as long as you have a dac with full MQA support
Using a mac:
Using plex as the player
- Run plex desktop
- In settings/player choose your dac and exclusive audio
- in plexamp cast to plex
plus: auto switches sample rate
minus: more moving parts
directly with plexamp
- run audio midi setup
- Choose 48/32 for your dac
- Make sure you have software volume to max and use the flat equaliser
Either Way… enjoy your MQA 
Now for the feature request… Could you ask the mac audio api to change the sample rate to the track sample rate? This would avoid having to keep audio/midi setup running and changing sample rate manually.