Hi colinegreen,
welcome to RuneAudio.
is there any way to control the playback from Rune running on my Iphone?
Rune has a webinterface, so it can be controlled from any webbrowser.
Is there a Bluetooth approach to wirelessly controlling the Pi-DigiAMP+?
Bluetooth is not possible at the moment, but your device (Raspberry) can act as AccessPoint (see
here).
If I built a portable player based on the IQAudIO Pi-DigiAMP+
The IQAudIO Pi-DigiAMP+ is supported by RuneAudio, but needs some software modifications (see
here).
I did something similar, but with HifiBerry Amp+.

- IMG-20160820-WA0000.jpg (74.92 KiB) Viewed 2113 times
Frank