HiFiBerryOS with Topping E30 USB

Hi team,


I am running HiFiBerryOS on Pi 4 with an USB Topping E30.

I am looking for a method of setting the USB Topping E30 soundcard to the default soundcard (so it persists after Pi 4 reboots). 

How can I "hard wire" the HiFiBerryOS setup to the USB card?


I tried:

1. changing the /asound.conf to card 1 instead of card 0, but this reverts after reboot.

2. changed /boot/config.txt to "dtoverlay=E30" but this gets overwritten after boot with an additional line of "dtoverlay=hifiberry-dac".

--- snip ---

# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 [HifiBerry DAC HiFi pcm5102a-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: E30 [E30], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0

--- snip ---


Thanks a lot!


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