The headphone jack of my “old” Picade does not seem to work properly.
First, when I connect the headphones, the speakers are not mutted. The only option is to manually lower the volume of the speakers until zero. In any case, the volume of the headphones stays quite low in most games, and cannot be adjusted via de volume keys (they only change the volume of the speakers that sound at the same time). This happens regardless the headphone type (iem, full size, etc.).
But the weirdest thing is that, when using the headphones, I can only hear some audio channels of the soundtrack. For example, in Sonic I can hear the cymbals of the music, but not the SFX or the beats of the soundtrack… In other games/emulators, it happens the other way around (I hear some sound effects but not the music). The missing sounds/channels are there, but in an almost inaudible volume. This is really weird…
I’ve checked the headphone socket in the PCB and looks ok (no lose connections). On the other hand, the sound via the speakers is perfect in all cases.
I tried the different PCB firmwares available, and the problem persists. Moreover the “experimental” firmware causes the buttons to stop working and the speakers to output hiss and static sounds.