I had Claude (Anthropic's LLM) look at the manual and it pulled out these shortcuts:
POD Express Bass - Key Combination Shortcuts
Amp Parameter Editing
Hold ALT + Turn COMP knob → Adjust amp GAIN
Hold ALT + Turn SYNTH knob → Adjust amp MID
Hold ALT + Turn DIST knob → Adjust amp BASS
Hold ALT + Turn MOD DELAY knob → Adjust amp TREBLE
Hold ALT + Turn AMP encoder → Adjust amp CH VOL (Channel Volume)
Master Volume & Hi-Mid/Additional Parameters
Hold ALT + Hold TAP + Turn DIST knob → Adjust Master Volume
Hold ALT + Hold TAP + Turn MOD DELAY knob → Adjust Hi-Mid parameter
For Grit amp: Adjusts Midrange Frequency (220 Hz, 800 Hz, or 3000 Hz)
For Vintage amp: Adjusts Bright switch (On/Off)
For Studio amp: Adjusts Midrange Frequency (150 Hz to 1000 Hz)
Cab Selection
Hold ALT + Hold TAP + Turn AMP encoder → Select/change Cab model
Noise Gate Parameters
Hold ALT + Hold TAP + Turn COMP knob → Adjust Gate Threshold
Hold ALT + Hold TAP + Turn SYNTH knob → Adjust Gate Decay
Preset Functions
Press & Hold AMP encoder → Enter Save mode
Press & Hold ON + TAP switches → Enter Preset Mode (scroll through presets)
Press & Hold both switches (while in Preset Mode) → Exit Preset Mode
Global Settings
Hold ALT + Press AMP encoder → Enter Global Settings
Press ALT (while in Global Settings) → Toggle between Settings pages 1 and 2
Other Functions
Hold TAP switch (1 second) → Enter Tuner mode
Hold ALT button (3 seconds) → Check remaining battery life
Hold ON + TAP (while powering on) → Factory Reset
I don't think I know the difference between Master Volume (Alt-Tap-Dist), Channel Volume, and the thumb wheel on the size.