Id say you'd still have a slight buzz happening, but nowhere near strong as you may think as xanax is short acting and clears out your system quickly.
Avoid adding any other depressants to get where you want to be if not there. This includes extra xanax.
Apart from raising your xanax tolerance, other CNS depressants increase the likelihood of an accidental overdose.
Exercise moderation and self control, knowing your dosing limits.