Does the master volume in the amp block effect the tone?
Yes, in fact for clean tones the Drive control should be set fairly low and the Master set very high. On a real “Blackface”, for instance, the Master is essentially maxed since that amp has no master volume. A Blackface typically achieves full power at around 10-11 o’clock on the volume (Drive). It’s also insanely loud. Beyond that the everything starts to saturate and clip. If you set the Master low and the drive high, for clean tones, the low end will tend to get muddy. Good cleans are obtained with little, if any, preamp distortion and a nice amount of power amp distortion. Power amp distortion has a much different character and tends to be glassy and bouncy. Preamp distortion is rougher and more compressed.
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