Playback setting with raspberry pi and Topping e30

I am a newbie. Just connected my new Topping e30 to the Pi via USB. Then connected the e30 to my receiver via coax cable. Pi is running in volumio. Earlier setup of pi to receiver via HDMI was working OK.

Question is on volumio playback setting. At Audio output set to USB:E30 and 12S DAC off, dac displays zeros and no sound. At 12S DAC On, the E30 is not listed among the DAC models. Tried some models but with no success.

What am I doing wrong?