FPP volume not working

The volume control doesn’t seem to be working on my fpp. Audio does come through though. Both on my push button and on my transmitter. I have the show running from a pi. I do have the picap as well and my splitter is plugged into headphone jack. Not sure if it needs to be plugged into rca. Any thoughts? Thanks!

Do I still need to use a sound blaster with the dac?

I thought audio was disabled when you used a picap. Are you using dpipixels to drive it? That would allow sound to be used.

If you have a sound blaster, you should use it. People that use it like the sound quality. Be sure to provide the whole setup with plenty of power.

How are you trying to set the volume?