making a sound, correctly

start with headphones

Before you wire anything into an amp or a PA, plug headphones in and load a factory preset. That proves the box works and gives you a correct sound to compare against later.

the cab block rule

A cab block is a simulation of a speaker cabinet with a microphone in front of it. It belongs in the chain whenever you listen on something with no guitar speaker of its own: headphones, a full-range powered speaker, the desk, your computer.

Leave it out when the signal ends in a real guitar cabinet. Two speakers stacked on each other sound muffled and small, and EQ will not rescue it.

plug it into your rig

Once you know what right sounds like, work out what your setup needs. The setup tool covers each case with the cabling and the settings.