dsf native to dac via usb?

L.s.,

This week I bought a Topping E30 dac. This dac supports dsd via usb only. PCM is possible via coax and optic. I'm running LMS 7.9.3 - 1591161343 through a squeezebox touch and I'm not able to get any sound out of the usb.

The same file played as DoP through coax, does give sound, albeit at 88,2khz.

Can anyone help me to get the dsd played as dsd via usb?

Thanks
(I couldn't find any threads, the searchbox doesn't show any results on whatever I type...)

Edvard