Unable to adjust balance via alsa

[PieEater]

Hi I think my problem is going to be related to my external DAC which is an ifi Zen DAC V2. If I make changes to the volume in Alsamixer or manually via amixer commands the changes are ignored, I can see that the changes have been applied on the software level but it's like my DAC is overriding them. I am definitely selecting the correct device in Alsamixer and amixer, does anyone have any suggestions? ifi state that they are not issuing Linux drivers which may be part of the issue.

I just need to adjust the balance on my left speaker slightly, I have managed to figure out how to configure Camilla DSP with a negative gain filter which works OK but I would prefer to avoid unnecessary processing if at all possible.

Thanks in advance.