Keep in mind that the sounds may slightly drop (not all sound heard) when multiple sounds are played at once. This is probably due to limitations of sample rate, and I made these sounds with higher bitrate than original DX-Ball sounds.
In addition, sound files other than DX-Ball/Rival Ball SFX are played in-game one octave lower (2X slower) than the normal pitch. So this sound mod were modified in Audacity to sound one octave higher when played in other media players, so that they sound with their original pitch in-game.
In the other hand, I also made this mod ( a separate files) for DX-Ball and Super DX-Ball, but the sounds are kept original (no editing), since the pitch remains the same. I noticed that this mod works even more better in those two, since none of the sounds were dropped if multiple sounds are played together (e.g when in chain reaction of exploding bricks).