||By design, between power-off and power-on, the CS-2110 'remembers' the state of the various buttons.
||At power on, all of the various buttons are in a default state, and cannot be changed. E.g. The mode setting is stuck at 'CH1'. Pressing any other mode button does not change the mode; it's stuck at 'CH1'.
||The internal 3V lithium battery (a CR2430) had run low.
||Removed battery. I did not replace it with new, because I did not need my CS-2110 to remember the button settings at power-off.
||The battery had leads and was soldered to its parent board. I cut it off at the leads.