Updated:
Ok. I tried a few more things today. I tried the FiiO app without success.
Back to the Hibymusic app.
I had trouble linking over Bluetooth which i require for in the go and commuting if i take the Max.
My music is fairly tightly curated so not much fast forwarding needed generally.
Paired with the iphone. Bluetooth and wifi.
Used as a fast forward/ play and pause/ rewind remote.
Iphone SE above and Max below.
You can navigate through and choose music.
Question: @artpiggo were you able to get it working purely over bluetooth only?
I am not sure. My friend borrow the unit during weekend so I will ask him to try that. May delayed answer.