1) may I use the NBG tape to activate my new behaviors?
Yes. Perhaps you have not made the realization that the Direct Learning Activation is primarily a variation of the New Behavior Generator process. The difference is that the Direct learning activation recording is tailored more specifically to physically activate the bahavior you want...the one you have PhotoRead to instruct your mind/body.
2)Can I listen to just the "b" side since the pr session put the skill I desired into my other-than-conscious mind?
Certainly. As much as you like.