Well.. I did not find a customizable solution for it, but I got the tip, that this is the splash screen video. I removed the sound from the video file and uploaded it back into Recalbox. Problem solved, startup sequence is silent now

The startup screen on 4.1 comes with some pretty nice sound effect, however it's (probably) set to 100% volume and sometimes pretty annoying when I startup the raspberry in my cabinet while e.g. being on the phone. Can this sound be set to a lower volume or even be disabled?

@subs I downloaded the full 0.78 romset and used it with Mame so I did not expect I have to check it if it's the right romset already. I will do a clrmamepro check and let you know.

Seems it is an issue with Mame 0.78, I got some ROMS for 0.161 and with FBA libretro all buttons work.

I also tried with WEST:

Event: time 1477119128.595417, type 1 (EV_KEY), code 308 (BTN_WEST), value 1
Event: time 1477119128.595417, -------------- SYN_REPORT ------------
Event: time 1477119128.765396, type 1 (EV_KEY), code 308 (BTN_WEST), value 0
Event: time 1477119128.765396, -------------- SYN_REPORT ------------
Event: time 1477119128.875396, type 1 (EV_KEY), code 305 (BTN_EAST), value 1
Event: time 1477119128.875396, -------------- SYN_REPORT ------------
Event: time 1477119128.985400, type 1 (EV_KEY), code 305 (BTN_EAST), value 0
Event: time 1477119128.985400, -------------- SYN_REPORT ------------
Event: time 1477119129.145393, type 1 (EV_KEY), code 304 (BTN_SOUTH), value 1
Event: time 1477119129.145393, -------------- SYN_REPORT ------------
Event: time 1477119129.255403, type 1 (EV_KEY), code 304 (BTN_SOUTH), value 0
Event: time 1477119129.255403, -------------- SYN_REPORT ------------

no change, in Mame, the second button does not react

I tried with several connections to the GPIO pins, none worked. Which GPIO pin relates to west?

here again with the joystick output:

Event: time 1477114546.715394, type 3 (EV_ABS), code 1 (ABS_Y), value -1
Event: time 1477114546.715394, -------------- SYN_REPORT ------------
Event: time 1477114546.895392, type 3 (EV_ABS), code 1 (ABS_Y), value 0
Event: time 1477114546.895392, -------------- SYN_REPORT ------------
Event: time 1477114547.165395, type 3 (EV_ABS), code 0 (ABS_X), value 1
Event: time 1477114547.165395, -------------- SYN_REPORT ------------
Event: time 1477114547.325407, type 3 (EV_ABS), code 0 (ABS_X), value 0
Event: time 1477114547.325407, -------------- SYN_REPORT ------------
Event: time 1477114547.635416, type 3 (EV_ABS), code 0 (ABS_X), value -1
Event: time 1477114547.635416, -------------- SYN_REPORT ------------
Event: time 1477114547.815413, type 3 (EV_ABS), code 0 (ABS_X), value 0
Event: time 1477114547.815413, -------------- SYN_REPORT ------------
Event: time 1477114548.155413, type 3 (EV_ABS), code 1 (ABS_Y), value 1
Event: time 1477114548.155413, -------------- SYN_REPORT ------------
Event: time 1477114548.315395, type 3 (EV_ABS), code 1 (ABS_Y), value 0
Event: time 1477114548.315395, -------------- SYN_REPORT ------------
Event: time 1477114556.825393, type 1 (EV_KEY), code 307 (BTN_NORTH), value 1
Event: time 1477114556.825393, -------------- SYN_REPORT ------------
Event: time 1477114556.995396, type 1 (EV_KEY), code 307 (BTN_NORTH), value 0
Event: time 1477114556.995396, -------------- SYN_REPORT ------------
Event: time 1477114557.175393, type 1 (EV_KEY), code 304 (BTN_SOUTH), value 1
Event: time 1477114557.175393, -------------- SYN_REPORT ------------
Event: time 1477114557.305423, type 1 (EV_KEY), code 304 (BTN_SOUTH), value 0
Event: time 1477114557.305423, -------------- SYN_REPORT ------------
Event: time 1477114557.475396, type 1 (EV_KEY), code 305 (BTN_EAST), value 1
Event: time 1477114557.475396, -------------- SYN_REPORT ------------
Event: time 1477114557.565413, type 1 (EV_KEY), code 305 (BTN_EAST), value 0
Event: time 1477114557.565413, -------------- SYN_REPORT ------------

@subs

all 3 buttons respond:

Event: time 1477073099.646921, type 1 (EV_KEY), code 307 (BTN_NORTH), value 1
Event: time 1477073099.646921, -------------- SYN_REPORT ------------
Event: time 1477073099.856952, type 1 (EV_KEY), code 307 (BTN_NORTH), value 0
Event: time 1477073099.856952, -------------- SYN_REPORT ------------
Event: time 1477073100.116937, type 1 (EV_KEY), code 305 (BTN_EAST), value 1
Event: time 1477073100.116937, -------------- SYN_REPORT ------------
Event: time 1477073100.276921, type 1 (EV_KEY), code 305 (BTN_EAST), value 0
Event: time 1477073100.276921, -------------- SYN_REPORT ------------
Event: time 1477073100.666922, type 1 (EV_KEY), code 304 (BTN_SOUTH), value 1
Event: time 1477073100.666922, -------------- SYN_REPORT ------------
Event: time 1477073100.846921, type 1 (EV_KEY), code 304 (BTN_SOUTH), value 0
Event: time 1477073100.846921, -------------- SYN_REPORT ------------

Just to be sure there's nothing wrong with my setup I just tried Gradius III for the SNES and there all 3 buttons are working perfectly.

I'm trying to run a few old games which need 2 or 3 buttons. In Emulation station everything is fine, but in any emulator, the secondary button is not recognized, e.g. in Ghosts'n'Goblins I can't jump. Or in Nemesis I can't shoot rockets. The third button is recognized again, so e.g. in Nemesis I can select power ups.

I first though I might not have the right wiring to the GPIO pins but it's the same with the keyboard. Pressing "X" has no effect in any game.

I also checked with jstest, everything is working fine.

Any ideas what I am doing wrong?

recalbox 4.0.0.b5