2.5 Randomization

 

2.5) Randomization

 
 

 

Beyond randomizing sound selection, in Wwise you can randomize the value of nearly every Property that can affect your sounds, such as Volume, Filters, and Pitch. This, in combination with randomizing sound selection, makes for an even greater variety of sound, without adding to the amount of memory needed at run-time. The Randomizer button is found to the left of a Properties value and looks like a small gray circle with a squiggly line through it.

Pic01 Volume Randomization

You’ll further modify the dog sounds by slightly randomizing the Volume and Pitch of the barking sounds.

Pic02 Volume Offset

Pic03 Pitch Randomization

  1. In the dog Random Container’s Property Editor double-click the Randomizer icon for the Volume Property.

    The Randomizer window opens, displaying an Enable checkbox as well as settings for a Minimum and Maximum Offset for the Container’s Volume. To hear any change that you’re about to make, you’ll need to first enable randomization for the Volume Property.

  2. Click the Enable checkbox.

    Notice that the Randomizer icon for the Volume Property has turned yellow, indicating the randomization for Volume is now active. Although randomization is technically activated, you won’t hear any difference until you modify the Min./Max. values. These Min./Max. values are the range of relative offset values that center around the value set in the Property Editor for this Property. In the case of Volume, the values are expressed as dBFS. (Pic01 Volume Randomization)

  3. Alter the Minimum and Maximum Offset a little bit, to get some Volume randomization. (Pic02 Volume Offset)

    But be very careful with the Max. value, this could potentially hurt your ears! For example, +12dBFS as offset could already make the sound extremely loud. Try something more subtle. The nice thing about this is that every time the Random Container picks a new random sound, it is then being played back by a a new random Volume Offset.

  4. Now, in the dog Random Container’s Property Editor double-click the Randomizer icon for the Pitch Property.

    The Randomizer window opens, displaying an Enable checkbox as well as settings for a Minimum and Maximum Offset for the Container’s Pitch. Again, you’ll need to first enable randomization for the Pitch Property in order to hear any change that you’re about to make.

  5. Click the Enable checkbox.

    Now also the Randomizer icon for the Pitch Property has turned yellow, indicating the randomization for Pitch is now active. The Min./Max. values for the Pitch Offset are expressed as Cents. There are 100 cents of pitch per musical half step and a total of 1200 cents per octave. Similar to the Pitch Property of any Container, you can notice that as the sound gets deeper in pitch, the playback speed is getting slower and the length of the sound clip is getting longer.

  6. Alter the Minimum and Maximum Offset a little bit, to get some Pitch randomization. (Pic03 Pitch Randomisation)

  7. Play back the dog sounds and tweak Randomization of Volume and Pitch to your liking, to get some nice variations for the dog sounds.