MorphVOX has the ability to assign a key, mouse or joystick button to any sound effect.  The following dialog can be found from the Tools menu "Quick Effects..."  item.

Quick Effects Dialog
Generic Mappings

Listen Current:  Maps a key that will play the currently selected sound effect on your speakers only.

Play Current:  Maps the key that will play the current effect out to others.
Next:  Maps the key that will change to the next sound effect.
Previous: Maps the key that will change to the previous sound effect.

Mappings

On:   Activates the current mapping so when the key is pressed the sound effect plays out to others.

Keys: Mapped key name.
Name: Name of the effect.
Change:  Push the "set" button to assign a key to the effect.
 
* You can right click on a sound effect and select "Play Current Effect" to hear the effect.
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