The left footswitch LED on the AMP1 changes in brightness
When the CLEAN Channel is activated, the LED on the left footswitch on AMP1 changes its brightness depending on the signal level. Inside the AMP1, there are LEDs that act as visual confirmation signals of signal flow and signal level. These can be seen through the plastic ring around the channel select footswitch when the CLEAN Channel is activated. This is completely normal and has no effect on the sound.
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By the way:
These LEDs always work, but can only be seen from the outside when the CLEAN Channel is selected.