When creating the sound effects for my game I used two different methods to create them.

For the music I used the method you see on the left using the VSTi effects and an empty midi file I could create the sound pattern I wanted to use for my music.

The other method I used involved layering sound files and then adjusting the pitch and speed that the sound would play at to get the desired sound. I used this to create most of the sound effects in my game such as the explosion sound and the projectiles sound.

Once I had done that I simply clicked the folder icon to find the sound file I wanted to use and selected it. Then I closed the folder and ran my game to find out if it worked.