Hi there.
You're very much in the wrong sub forum, and PT 6.7 is quite old so my advice might be a little off.
None the less, in modern Protools at least, you create an instrument track and an audio track.
On the instrument track, insert 'signal generator'.
Set the track output to 'bus 1+2'.
On the audio track, set the inputs to 'bus 1+2'
Arm the audio track for recording, and hit master record.
That should be it.