Each sound clip allows you to shape 6 parameters over time, so that you can, for example, fade audio in, and out, cut the volume in certain locations, pan from left to right speaker over time and more. Each sound starts out with 2 envelope points at the start and end of the sound. You can click on an envelope point and move it around to the desired location.
(The above image shows how to move an individual point.)
To add a point, move the mouse until it becomes a pencil tool, then left click and a new envelope point will be added.
You can move an "envelope line" by clicking on a horizontal line and dragging it up or down.
To switch the type of envelope, click the "Show Env" drop down on the toolbar.
Each sound has volume, pan, Low Pass Cutoff, Low Pass Resonance, High Pass Cutoff & High Pass Resonance envelopes.
Add envelope points for fades, cuts, or boosts, raising or lowering the sound’s volume. The range is 0% to 200%.
Add envelope points to pan the sound from left to right speaker. The range is 100% left speaker to 100% right speaker.