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Tutorials Tutorials » Audio

Categories Flash MX Sound Object Tutorial
Author: Kenny Bellew

 
Page 15
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How to Fast Forward and Reverse a Sound Object


Fig. 13: Example of fast forwarding and reversing a sound object

The following approach will show how to have the sound skip forward and backward while the fast-forward or rewind button is being held down. In this example, sound will be heard skipping forward or backward, but it will not be legible and it will not sound like audio time is compressed. Experiment with the Flash example in Fig. 13 to understand how it will sound.

When the fast forward button is held down, the sound object will stop, skip forward in position slightly, play very briefly, stop and repeat this cycle until the button is released. The speed of fast-forward or reverse can be controlled by how much is added to or subtracted from the sound object position each time. For this example, the increment is fairly small because the sound is so short. For practical use, a setting of a few seconds should work nicely.

  1. Define your sound object.
  2. Place buttons on the _root timeline. For this example, the reverse button will have the instance name of "REVButton", and the fast-forward button will be called "FFButton".
  3. Place the following code on a one-frame movie clip that loops:

    this.onEnterFrame = function () {
    //Reverse
    if (REV==1 && myMusicPosition>0) {
    _root.myMusic.stop("myMusic01");
    myMusicPosition=myMusicPosition-.5; //The .5 is the decremented amount.
    _root.myMusic.start(myMusicPosition,0);
    }
    revButton.onPress = function () {
    REV=1;
    myMusicPosition=_root.myMusic.position/1000;
    //
    }
    revButton.onRelease = function () {
    REV=0
    }
    //Fast Forward
    if (FF==1 && myMusic.position _root.myMusic.stop("myMusic01");
    myMusicPosition=myMusicPosition+.5;//The .5 is the incremented amount.
    _root.myMusic.start(myMusicPosition,0);
    }
    FFButton.onPress = function () {
    FF=1;
    myMusicPosition=_root.myMusic.position/1000;
    }
    FFButton.onRelease = function () {
    FF=0
    }
    //END
    }

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» Level Intermediate

Added: : 2002-08-13
Rating: 9.12 Votes: 657
Hits: 3000
» Author
Kenny Bellew is a technical writer in Minneapolis, MN. He's currently interested in becoming involved in other writing-related Flash projects.
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