Can anyone tell me if Ness leaves his MXR Carbon Copy delay pedal on all the time? I was thinking of getting one of those pedals cause I use a blackface bassman with a Les Paul with p90's and I can't get the thick tone he has here:

http://youtu.be/bRJwc2xNr5M

I'm wondering if the delay pedal is used to make the guitar sound thicker.

Probably not.

That guitar sound isn't what I know to be a bassman sound. There is a bit more going on there. It definitely isn't amp only distortion. It sounds too defined and attacking to be a power section driven bassman. There is likely some generic type of treble booster going into it.

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No no and no

check this:

http://www.youtube.com/watch?v=uvrPkVgejI0

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I'm not an expert, but I play one on the internet.