Nice set-up
i did a bit of a google and found this reply on the Mod my pi form
https://forum.modmypi.com/technical-support/allo-boss-raspberry-pi-master-dac-t1369-10.html
Best to leave it at 0db I think
> ntroduction
>
>
> This directory contains Device Tree overlays. Device Tree makes it
> possible
> to support many hardware configurations with a single kernel and
> without the
> need to explicitly load or blacklist kernel modules. Note that this
> isn't a
> "pure" Device Tree configuration (c.f. MACH_BCM2835) - some on-board
> devices
> are still configured by the board support code, but the intention is
> to
> eventually reach that goal.
>
> On Raspberry Pi, Device Tree usage is controlled from
> /boot/config.txt. By
> default, the Raspberry Pi kernel boots with device tree enabled. You
> can
> completely disable DT usage (for now) by adding:
>
> Code: Select all
> device_tree=
>
>
> to your config.txt, which should cause your Pi to revert to the old
> way of
> doing things after a reboot.
>
>
>
> Name: allo-boss-dac-pcm512x-audio
> Info: Configures the Allo Boss DAC audio cards.
> Load: dtoverlay=allo-boss-dac-pcm512x-audio,
>
> Code: Select all
> Params: 24db_digital_gain Allow gain to be applied via the
> PCM512x codec
> Digital volume control. Enable with
>
> "dtoverlay=allo-boss-dac-pcm512x-audio,
> 24db_digital_gain"
> (The default behaviour is that the
> Digital
> volume control is limited to a
> maximum of
> 0dB. ie. it can attenuate but not
> provide
> gain. For most users, this will be
> desired
> as it will prevent clipping. By
> appending
> the 24db_digital_gain parameter, the
> Digital
> volume control will allow up to 24dB
> of
> gain. If this parameter is enabled,
> it is the
> responsibility of the user to ensure
> that
> the Digital volume control is set to
> a value
> that does not result in
> clipping/distortion!)
> slave Force Boss DAC into slave mode,
> using Pi a
> master for bit clock and frame
> clock. Enable
> with
> "dtoverlay=allo-boss-dac-pcm512x-audio,
> slave"
>
>
>
> so editing the config.txt file to include the line
>
> Code: Select all
> dtoverlay=allo-boss-dac-pcm512x-audio, 24db_digital_gain
>
> should allo raspbian to load the correct modules so that it can see the
> DAC as a device for you to send sound to.
you can check in th ALSA settings
ronnie
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