Connect a cable output to input of your sound card. Send a signal thru the cable and record the return.
Save the record and open it with audacity. Zoom (ctrl+1) and check when begins the signal. The unity is 1 ms so you should see what is the latency of your daw + soundcard, this is the space at the beginning before the signal appears.
Now connect the same cable to the output soundcard -> input of the KPA then the output of the KPA -> input soundcard. Send a signal and record the return.
Save and check into audacity when the signal begins.
Then substract time 1 from time 2 and you will get the latency of the KPA. IMO