Samick DCP-8 Manual page 46

Using the Numeric Data Entry keys, enter the Bank LSB value you want to send.
NOTE
As an alternative to using the Numeric Data Entry Keys, you could instead use the
Data Control knob to choose the Bank LSB value in this step.
Press the Enter Key (C7) to send the MIDI command.
2.To Assign the Data Control Knob to Send Bank LSB Changes:
Press the [Voice/Function] button to enter Function Mode.
Press the Bank LSB Data Control Key (Ab1).
The LED display will momentarily show:
NOTE
That this is different than the Bank LSB Key (Ab5) that you used to input a
single Bank LSB value.
Voice / -
Function
Ab1
42