Swork13,
Both POWER CONTROL (watts) and MASTER VOLUME settings are analog controls, neither can be stored to internal memory.
POWER CONTROL (watts) and MASTER VOLUME react same as similar named controls on a modern A/B class Tube Amp
For example compare:
POWER AMP SETTING (A) - with the POWER CONTROL @ (50 watts), and MASTER VOLUME @ "10"
vs
POWER AMP SETTING (B) - with the POWER CONTROL @ (100 watts), and MASTER VOLUME @ "5"
The result is both POWER AMP SETTINGS (A) & (B) will have similar SPL decibel level at the speaker, however I observe:
* POWER AMP SETTING (A) will be more distorted, because the MASTER VOLUME on "10" will "drive" the Class A/B power Amp into saturation / clipping smooth distortion.
* POWER AMP SETTING (B) will be less distorted , because the MASTER VOLUME on "5" will have less less "drive" feeding the Class A/B power Amp and with POWER CONTROL set to 100 watts, the Katana delivers more clean headroom.