Trying to add support for NAD D 3020

[mars68]

I have a Pi connected via usb to an NAD D3020 amplifier, which is seen as a DAC.
Works great but for the hardware volume control.

What are the steps involved in making hardware volume control work for a specific DAC ?

Do I need to add an entry in redis_acards_details for the NAD D 3020 ?

Below an excerpt of dmesg and the output of lsusb.

Thank you.

110060.307188] usb 1-1.2: new full-speed USB device number 10 using dwc_otg
110060.628269] usb 1-1.2: New USB device found, idVendor=17ae, idProduct=0003
110060.628307] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
110060.628326] usb 1-1.2: Product: NAD USB Audio
110060.628345] usb 1-1.2: Manufacturer: NAD Electronics
110060.628362] usb 1-1.2: SerialNumber: (C) 2011 Wavelength Audio, ltd.

[root@runeaudio db]# lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/3p, 480M
|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M
|__ Port 2: Dev 10, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 2: Dev 10, If 1, Class=Audio, Driver=snd-usb-audio, 12M

[cmh714]

Your DAC has to support hardware volume control....

[mars68]

Your DAC has to support hardware volume control....

Indeed

How can I check if the DAC does support hw vol control ?
Or do you mean that the fact it doesn't work out of the box means hardware volume control is not supported by the DAC ?

Tx
--

[ACX]

Your DAC has to support hardware volume control....

To quickly check if your DAC has it, type alsamixer in the CLI and see if your device is listed after pressing F6.

[mars68]

Your DAC has to support hardware volume control....

To quickly check if your DAC has it, type alsamixer in the CLI and see if your device is listed after pressing F6.

I can definitely see the device when pressing F6.

Card: NAD USB Audio
Chip: USB Mixer

But still enabling hardware volume control in the UI doesn't have any effect.
Nor playing with the volume control under alsamixer: the "db gain" increases from 0.0 to 0.49, when i move the volume under alsamixer from 0 to 100 ...

[ACX]

Ok, an update for this kind of cases is going to be released soon. Keep an eye on the 0.3-beta main thread.

[mars68]

Ok, an update for this kind of cases is going to be released soon. Keep an eye on the 0.3-beta main thread.

Thank you ACX, will watch for updates.