How to search an amp in alphabetical order ?

Quote from azertyvince

How to search an amp in alphabetical order ?

In the Profiler itself: "Sort by Amp/Cab", use the RIG cross then. Left/Right for small steps, Up/Down for Amp itself

Quote from azertyvince

We can not search with letters : "M" for Marshall, "F" for "Fender ... ?

I recommend using the Rig Manager.

Also, in the 'normal/main' display view, press the up or down RIG buttons to cycle through the first letters of the rig.

does that help?

Quote from azertyvince

We can not search with letters : "M" for Marshall, "F" for "Fender ... ?

If you have that much Rigs, that this matters, please consider using Rig Manager, which allows you a broader spectrum of sort & search.