I've been playing for months and I never really disliked the default sound effects for the game... but on a whim I decided to replace the jump sound effect with a nice cartoonish springy sound. Here's what I wound up with... I liked it a lot more than I thought I would... also quite amusing and helpful in-game, not as obnoxious as you might think. I think it actually suits the tone of the game a lot better. Check it out!

DOWNLOAD: http://filesmelt.com/dl/AoS_BoingJump_SFX.zip

USAGE: Unzip to the WAV folder in your Ace of Spades program folder... it will overwrite the existing jump.wav. If you want to go back to the default sound, just delete the new sound file and rename the conveniently-provided backup file.