Looking at the schematic for the V5, I understand that the way it works is that the CW key line (DC) is fed into mixer 1 along with the Clock #2 signal.? The output signal path from this is then through the 45 MHz low pass filter (I think that's what it is on the schematic) and then into the normal transmit power output chain through Q90.? Isn't that the same as CW?
Regardless, for testing it in SSB, could I use the tune output from a digimode program such as Fldigi?