Simple explanation on keystroke to slider?

I'm planning to use Midi Translator to control Capture One.

A previously created preset for Capture One and the Korg Nanokontrol2 would be a dream to me right now!

To start things off... I was hoping someone could simplify how I take a slider from the nanokontrol2 and translate the negative and positive values to the exposure slider in Capture One for example.

Positive Exposure is: Command + Shift + +
Negative Exposure is: Command + Shift + -

Is there a simple explanation to how I can translate these negative an positive values onto a slider?

Thanks for any help!

Could you connect your Nanokontrol to MTP and read the incoming messages from the fader on the log window? This will be the first step in formulating a solution for you!