Indexed by what you notice, not by what the subsystem is called — because when something is wrong you know there's no sound, not that it's a routing problem.
9 of the 11 problems below are not faults. They are documented behaviour that looks like a fault, and they are marked working as designed. “Your unit is fine” is a useful answer and nobody publishes it.
In Play view, press ◀ PAGE or PAGE ▶ to cycle through Stomp, Scroll, Preset and Snapshot. This is the most common HX Stomp question by a distance.
HX Stomp Cheat Sheet (Rev C)Hold HOME and press ACTION. The word SAVE printed under the Upper Knob describes that gesture, not the knob.
HX Stomp Cheat Sheet (Rev C)It needs 9 V at 3 A from a single output. Most isolated pedalboard supplies cannot. Use the adapter that came with it — Line 6 recommend nothing else.
HX Stomp Cheat Sheet (Rev C)Update. Firmware 3.0 raised the cap from six blocks to eight, and it is free.
HX Stomp 3.80 Owner's ManualMake anything mono that does not need to be stereo. Into a single amp or a mono desk feed, that is everything.
Helix 3.80 Owner's ManualUse a single Amp+Cab block instead. That is two positions collapsed into one.
Helix 3.80 Owner's ManualBypass the cab. Into a real amp and speaker you want no speaker simulation; into headphones, a powered speaker or the desk you want it on.
Helix 3.80 Owner's ManualUse L/MONO for a mono rig. The right jack alone gives you half the signal.
HX Stomp Cheat Sheet (Rev C)Press ◀ PAGE ▶ in Edit view. Most blocks have several pages and the first one is only the beginning.
HX Stomp Cheat Sheet (Rev C)Hold FS3. Touching it instead opens the tempo panel.
HX Stomp Cheat Sheet (Rev C)Global Settings > Preferences > Snapshot Edits decides this. Recall (the default) keeps your changes as you left them. Discard returns the snapshot to its last-saved state — which is the behaviour you want live, and the behaviour that eats your work while you are building. Hold BYPASS and press SAVE to flip it at any time; the camera icon on the Home screen is grey for Recall and red for Discard.
HX Stomp 3.80 Owner's ManualThat is exactly what an unedited snapshot does — it carries the state you arrived with. It only becomes its own thing the moment you change something in it. Nothing is broken; you have simply not written it yet.
HX Stomp 3.80 Owner's ManualSaving a preset stores all of its snapshots and remembers which one you were on. If a song should always start on the intro sound, select that snapshot and then save — the choice is made at save time, not at load time.
HX Stomp 3.80 Owner's ManualNot the same problem as tails cutting off at a preset change, and it has a different answer — this one is a setting inside the block.
Trails Off mutes repeats and decays the moment the block is bypassed. Trails On lets them ring out naturally, through a bypass and through a snapshot change. It is set per block, so one delay left wrong is enough to make a whole rig feel abrupt.
HX Stomp 3.80 Owner's Manual