In Step 2 we explored the contribution that COUMBUSTION.1.02 made to the overall sound mix. Lets modify the Volume and Rate envelopes to see how we can change the way it sounds.
You may edit the waveforms directly in the previous dialog by using the mouse to drag the line segments. To edit a single waveform in more detail, select COMBUSTION.1.20 in the list box and click on the Edit... button, or double click on the entry. This will start the Envelope Editor. Note: This dialog can be resized to make it bigger.
The Volume and Rate envelopes are shown both graphically and in a numerical table format. Note that the Sound Preview window continues to function while the Envelope Editor is active, and any changes made in the Envelope Editor are immediately reflected in the Sound Preview Window.
Editing the Volume Envelope
Make sure you're still listening to the Preview sound, if not press the PLAY button in the Preview dialog. In the Envelope editor,move the mouse over the Volume graph, somewhere near the middle of the envelope. As the mouse hovers over a graph point, the cursor will change to a cross shape. Press and hold down the left mouse button, and drag the point to a new position.
As the mouse moves, the envelope is redrawn with its new shape, and the Table is updated with the new values. At the bottom right corner of the graph, the current mouse position is tracked. The Sound Preview is also updated with the new envelope shape. While dragging points to reshape the envelope, note the changes in the preview sound.
Editing the Rate Envelope
The procedure used to edit the Volume envelope can also be used with the Rate envelope. It has only two values, so grab one end or the other to reshape the sound, and note the difference made to the sound in the Sound Preview.
Move the Panning slider left or right to change the apparent sound position. This is useful if you have a multi-engine aircraft -- you can place the sound's apparent origin to be from the left or right side of your sound system.