Indicate effect of holding down jump button through sound

[qubodup]

I witnessed that players manage to solve 'hold down the jump button to jump higher/longer' in safe situations (blocks that are out of reach by tap-jumping) through experimentation, but fail to remember this mechanic later in critical situations (two platform robots moving over a pit, player has to coordinate a long/high jump.

Perhaps we can make the player realize the difference between short and long jumps through sound one of the following ways:

1. Stop playing the jump sound, as soon as the jump button is released
2. Quickly (n=0.05 seconds(?)) fade out the jump sound, as soon as the jump button is released