DAC/Sequencer mode suggestion

I thought the following would be really useful:

**IF** channel 4 is in DAC/Sequencer mode **AND** it's clock source is "off" **AND** the sequence edit window is open, it's output would update in real time with the voltage set for the currently selected step.

This would make the sequencer much easier to set up given that some fine tuning is necessary to overcome non-linearity of the DAC.