With the help of many here, I have successfully customized my retropie startup, from power on you see my personal logo, then MAME.. One last thing would make it complete, is there a way to play a short sound file (wav perhaps) during the splash screen? Thanks all!
I was able to accomplish this with a command line mp3 player. I used mpg321, and basically added a single line to rc.local to play the mp3. Before that runs, i actually use a bash script to write a path to a random mp3 to a .m3u file which gets played by the line in rc.local.
I found a bunch of R2D2 sounds and play a random one during startup.
^^ my other hobby