Volume control external USB sound card. mopidy config help

Hi, I got mopidy working great on an old eeepc 701, running peppermint OS 6.
I have an external sound card (m-audio fast track) with this configuration it works great but i dont have volume control in any software, eg music box or mpdroid.

mixer = alsamixer
output = alsasink device=hw:1,0

card = 1
control = Master

enabled = false

So I tried to change it to


mixer = software

output = alsasink device=hw:1,0

But that broke audio output and gave me gstreamer errors.
What is the correct config for using the card and retaining software volume control?

Thanks for any help!

Assuming you removed softwaremixer/enabled = false or set it to true that should just work. Also there isn’t any need to disable the softwaremixer extension. It just won’t do anything if audio/mixer isn’t set to software.