Volume up/down with USB-sound card

[oloff3]

Hi!
I have been building a GameBoy Zero into a Nintendo DS and are almost done.
But I can't get the hotkeys for volume up and down to work.

I just have added the lines into my GPIO joypad cfg files to bind input_volume_up = "button value".

Edit:
I have managed to get the volume setting to work from the EmulationStation menu but not with Hotkeys while playing a game.

Any idea what I am doing wrong?
Best regards
Oloff3

[retroprogrammer]

Did you setup Hotkeys when you were imputing the button controllers for your Game Boy ,Nintendo DS, Nintendo DS Boy :)

[oloff3]

@retroprogrammer
I configured one button to hotkey. And hotkeys like exit emulation, reset, state saves works fine, but for some reason the volume control don't work.

[mitu]

@oloff3 You could try something like:

input_volume_up = +<button value>
input_volume_down = -<button value>

or another approach is described here https://retropie.org.uk/forum/topic/2377/control-volume-through-retroarch-with-keyboard/4, outside of RetroArch. The example in the topic is more for the keyboard use, but if you can make the events appear as keypresses, the principle is the same.