Please add some info about your setup, as detailed in https://retropie.org.uk/forum/topic/3/read-this-first.

As far as Linux (and RetroPie) is concerned, your 'headphones' are just an USB audio card - disable the onboard audio and they should be come the default audio card on the system.

@iss05e said in Amiberry - no sound through headphone jack:

The previous version of Amiberry inherited the Audio options set in RetroPie. I guess Amiberry v5.3 no longer does this.

It didn't, it was just a concidence that it worked. It probably just used the 'default' (which is set via the RetroPie audio settings).

I found an easy way to do this.

I just needed something like a Turtle Beach Ear Force DSS 7.1 Dolby Surround Sound Processor.

One can find that on Ebay currently for $10.

https://www.ebay.com/itm/272275549904

Here are the steps I used to make a pair of JVC Bluetooth headphones with my Pigrrl 2.0 project.

Most of this was provided by Dawidekziaja I just changed it where I had to use a different method or added a step.

First run sudo update/ sudo upgrade

run sudo nano /etc/rc.local
Before the line that says exit, add a line and type sudo bluealsa &
ctrl+o
ctrl+x
reboot run sudo bluetoothctl (connecting using the retropie bluetooth caused me some issues)
Then type:
power on
scan on
Find the mac address of your audio device, write it down for later.
trust xx:xx:xx:xx:xx:xx
pair xx:xx:xx:xx:xx:xx
connect xx:xx:xx:xx:xx:xx

Download asound.conf using this template https://www.dropbox.com/s/kotq703r6hso9r5/asound.conf
sudo nano /etc/asound.conf
I uploaded it to the Pi using FileZilla and used the "mv" command to place it in /etc - you can either change the file using nano or on a computer like I did

Replace xx:xx:xx:xx:xx:xx with your MAC address and A description of your device with a description of your device and paste into your terminal, replacing all contents that were already there.
ctrl+o
ctrl+x
I created .asoundrc by using nano. Sudo nano

defaults.bluealsa.interface "hci0"
defaults.bluealsa.device "XX:XX:XX:XX:XX:XX"
defaults.bluealsa.profile "a2dp"

". Replace xx:xx:xx:xx:xx:xx with your MAC"

ctrl-x
y

then type: ~/.asoundrc

reboot

Type sudo nano and create the following file

options snd_usb_audio index=0
options snd_bcm2835 index=1
options snd slots=snd-usb-audio,snd-bcm2835

save it as /etc/modprobe.d/alsa-base.conf

In retropie select the config and click bluetooth.
Now select "Connect Now to all registered devices."
DO NOT PAIR THE AUDIO DEVICE IN RETROPIE

Turn off the devices Wifi - I found that this made sound terrible for some reason. cvdrf

Go back to retropie and test audio. It should work! If it doesn't, but your device is connected, reboot your bluetooth audio device and try this step again.
Feel free to reply with any issues.