Years ago,I found my day-end records (financial) were prone to errors, as I was tired. I purchased the Human Plus called "Buy the Numbers" and listened to it twice. To my surprise and delight, my day-end records became consistently accurate. I do not think I have since listened to that tape.
Maybe someone from LSC can answer your question, but in my opinion I do not see why there would be a problem using the products in conjunction.
I do wonder why you are so aggressively listening to tapes though...
vitaman
