Guitar reverb effects pedal help.?

I own a Fender Mustang amplifier and when using it I create presets which can simulate the use of effects pedals. When I go over to the category for reverb effect pedals the knobs for the reverb effects confuse me. The knobs that are there are named "Level, Decay, Dwell, Diffusn and Tone". I need to know how these different knobs affect the sound the reverb pedal makes the guitar sound like. Examples of these would be nice to if you can. Thanks