This doesn't use [pattrstorage] but will save parameter names and values using [umenu] and [coll], and allow users to set and store those values without opening the vst window.
I used Apple AU Matrix Reverb for the example.
I can think of a few ways to do this using [pattrstorage], but not sure your exact goal. If the plan us to have users create and save a variety of recallable vst settings from within Max using [paatrstorage] the first step might be to make a list of available parameters along with their ranges and create matching flonum objects whose range is limited to a paramater range. Then it's just a matter of creating the UI and naming the flonum objects so [pattrstorage] can store their values.
Thank you both for your answers!
What i want is to save the state of a vst together with all the other controls on my patch so when i load a preset from pattrstore, the vst will be at the state it was saved.
I didn't have the time to properly check and experiment with your patches, will do soon and get back to you!
Thank you again!