Advice needed for an USB DAC

[Nutul]

@Nutul 

What, you mean the rectangular button helpfully labelled "switch" in the break-out picture in the product description on the Shenzhen Audio website? I dunno. Could be input selector; could be power.

I was so taken by the explanation of MQA in that same product description that I didn't spend a lot of time with the rest of it.

Regards,
Kent

Looks to me that short-press => source selection, long-press => power-off.

ETA
I also found this quick review of the SU-1, by Randy... ;-)

https://www.youtube.com/watch?v=GUf0heY1...apaudioman