Help nig 13, jumpin sound

[Nig 13]

Too vague, could you post all the code for the character or even possibly the FLA file?

What you can try, though, is to right-click your jumping sound in your Library, pressing Linkage, ticking/checking Export for Actionscript, and typing in the Identifier field, jump_sound, pressing OK, and changing your code to this:

onClipEvent (enterFrame) {
    if (!attacked) {
        if (jumped) {
            falling += 0.5;
            _y += falling;
            if (touchingGround) {
                jumped = false;
            }
        } else {
            if (Key.isDown(Key.UP)) {
                jumped = true;
                falling = -jumpHeight;
                this.gotoAndStop(4);
                jumpSound = new Sound();
                jumpSound.attachSound("jump_sound");
                jumpSound.start();
            }
        }
    }
    if ((Key.isDown(Key.UP)) and (Key.isDown(Key.LEFT))) {
        this.gotoAndStop(4);
    }
    if ((Key.isDown(Key.UP)) and (Key.isDown(Key.RIGHT))) {
        this.gotoAndStop(4);
    }
    if ((!Key.isDown(Key.UP)) and (!touchingGround)) {
        this.gotoAndStop(4);
    } else if ((Key.isDown(Key.UP)) and (!touchingGround)) {
        this.gotoAndStop(4);
    }
    if ((_currentframe == 4) and (touchingGround)) {
    gotoAndStop(1);
    }
}
onClipEvent (keyUp) {
    if (!attacked) {
        gotoAndStop(1);
    }
}