Squeezelite — No Sound

I have been hugely enjoying the Dietpi on my new Allo DigiOne — at first as Roon Bridge, and then playing around with GMRender and BubbleUpnP. All fine!

Next I wanted to experiment with Squeezelite. I installed LMS on my Qnap, and iPeng on the iPad. The LMS on the QNAP appears in iPeng, and also the DietPi-Squeezelite as player. But I don’t get any sound — my streamer/DAC (Naim ND5XS) doesn’t seem to receive any signal from Squeezelite/Allo DigiOne.

Any idea what I might be doing wrong?

Many thanks,
Timo