Look it up fast

Every control on an interactive top panel, including the toe switch and the two EXP LEDs nobody notices.

Every jack on an interactive rear panel — and a straight account of what the LT gives up against the Floor.

The numbers that answer a question, with the Floor comparison on the lines where it differs.

All 440 amps, cabs and effects decoded from Line 6's own list.

Two settings decide whether it sounds like the demo or sounds broken. Both live in a menu, and neither is a tone control.

What an impulse response is, how to load one, and why a downloaded preset can load fine and still play the wrong cabinet.

Why it stops you adding a block when the meter looks half empty.

Pick what you're plugging into and get the cabling and the cab block state.

Which layer a change belongs on, and why the wrong one leaves a gap.

What a controller can actually reach, the three messages that recall a sound, and the trick that lets one preset serve several songs.

Straight answers to the things people actually ask.

Symptom, cause, fix — including the entries that are documented behaviour rather than faults.

What an update changes, what it leaves alone, and the one-minute backup that means it never costs you anything.

Block, path, snapshot, L6 LINK, Legacy — plain definitions.