no sound

Have a Pi3 with HiFiBerry DAC+ Pro. Volumio version: 2.323 17-11-2017
No sound.
I’ve disabled i2s dac, saved and rebooted, then enabled i2s dac, selected HiFiberry DAC (there is no HiFiberry DAC+ option, could that be the problem?) and saved and rebooted countless times but still no sound. If I set it to Allo Boss the sound does work but is badly distorted.

Fortunately I still have a volumio version 1.55 that works fine on an old sd card (I cannot make another that works for some reason).

root@volumio:/home/volumio# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
Subdevices: 8/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

I notice on hifiberry.com/build/documen … iguration/
(where I found out about ‘aplay -l’).
They give this:

DAC+ STANDARD/PRO

snd_soc_bcm2708
bcm2708_dmaengine
snd_soc_pcm512x
snd_soc_hifiberry_dacplus

So I am guessing that the new volumio has not been made configurable for the HiFiBerry DAC+?

If so I would be grateful for advice on how to do it manually.

I’ve found the solution eventually.

via ssh go to /boot/config.txt
root@volumio:/home/volumio# nano /boot/config.txt

Then add plus to dtoverlay=hifiberry-dac
as:
dtoverlay=hifiberry-dacplus

Save and reboot.