Ok so I wrote down the audio file from the gknova6 site.
I separated the voices as that might be a clue, also as you can see there's a pause every 5 letters. (Sorry about the formatting kinda hard to make it line up)
NOV *BEEP**BEEP*
NOVAS|I----|-SIX-|O-ESI|--O--|-I--O|VA-IX|NO-AS|I-N-V|-SI--|-V--I|X---A
-----|-XNOV|A---N|-V---|XN-VA|S-XN-|--S--|--V--|-X-O-|A--XN|O-AS-|-NOV-
Note that on the original audio file, the 3 beeps meant move all the letters over by 3 and that's how they came up with www.gknova6.com so maybe the 2 beeps here are important as well, although moving the letters over by 2 either direction doesn't seem to make sense.