well, the addition of p-toluene sulfonic acid is only to get the pH to about 4.5. In essence, if the pH is already 4.5 without p-toluene sulfonic acid, then I would not need to add any p-toluene sulfonic acid.
So, to reframe my first post, I only needed to know how to make ammonium acetate buffer of pH about 4.5 with liquid ammonium hydroxide and liquid acetic acid.
I think I confused you with p-TSA.