French Books recommended by Gabriel

I posted a query about this some time ago. I'm disappointed, that from the thousands of people learning

French using this method thus far, no one has the capacity to reply.

I suppose the new application directed attention away from this forum, which used to be more prolific.

Do Gabriels book recommendations for French still apply when using the Pronunciation Trainer?

This is the CLE International Phonetique 'Intermediate' text he used at Middlebury.  Is it still

useful or necessary, or just not worth the investment once one has the Pronunciation Trainer?

Does one need the seperate 'Answer' book as well?

Same too for the CLE International Grammar text Gabriel recommends.

Should one buy beginner or intermediate?

Is the Answer book necesasry?

Thankyou!