Does different grounding techniques effect tone?

[Steveo]

Ive heard and read that grounding can change the tone of the amp. Has anyone tested this? I wouldnt think it would matter.

[pompeiisneaks]

From my point of view it would never impact the 'tone' but it will make an amp quieter/noisier? Maybe you could call more or less hiss/hum as 'tone'?

Grounding points don't pass signal to the output, they remove some of the signal itself I'm sure, unless some of the 'ground loops' also act like a form of feedback... then I guess it could have a tone altering factor?

~Phil