I have a Spider Valve and it has three built in Bark At the Moon settings. One says Bark At Moon which has phaser and the most distortion , another Barking Moon which has a little less distortion and no phaser , and the last Bark Moon Lead which has little less distortion and phaser and delay. My question is which settings do i use for the different parts of the song. Hope this isnt confusing.
Ummm. I imagine the highest gain setting will be the chords in the song. The second least dist. should be the solo, and then the Lead tone is probably for the outro.

Hope that helped. I'm not sure if I'm right though.
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Bark At Moon = intro/verse riffs
Barking Moon = chorus riffs
Bark Moon Lead = Solo and outro solo

thats my guess