Quoted from Aeon:New sound has to be the same length or shorter in most cases, but not all. It depends on how the software in FG uses the different sounds. Sometimes it doesn't even play the full length of the original sound either. NBII does not support multiple sound clips in a folder.
Here are a short video just so you can get a feeling of the custom music and sound that you can change with the NBII board. You can hear a different "machine gun" sound from the pop-bumpers (sound clip from the movie of course) and Flash Gordon himself talks when you loose a ball in the outlane.
Well THIS is awesome! Anyone tried to do something similar using Pinduino? Seems you'd have a lot more freedom and flexibility to use whatever original sounds you wanted with proper movie callouts and Queen songs... Sorry if I offend the purists.