Both sets of samples begin with an example of the passive pickup only, then using the Unity Gain Buffer. Each group goes through each of the five switch/pup positions. Volume on the guitar is 10, tone controls are at 10. The volume is increased for the UGB samples to compensate for what I believe is referred to as the "Psycho-acoustic effect", which simply is the way "louder" appears to sound "better" to us, especially in comparisons.
Group 1: Passive only UGB on, volume same as above UGB on, volume on amplifier turned up to compensate for the UGB loss
Group 2: Passive only UGB on, volume on amplifier turned up to compensate for the UGB loss