PierM

Just go back to the store and pick another one. This is not something you can fix yourself, without voiding the warranty and stressing yourself for no reason. :)

Description gave me an headache. These things, without a sound sample of the problem and a very specific documentation on power sources, routing, devices involved and settings, are just opening a door for an infinite list of assumptions, guessing or different interpretations of that "tremolo" effect. Never had/heard something similar tho.

Point is, if you DIY, you will void the warranty for any future/further possible assistance. I would still let do the job to a Line6 licensed center, like Thomann, and keep the warranty alive as much as you can. ;)

Well, it depends on the frequency spectrum you are generating with any of those sims (**), and the dB at the mix output that it's hitting the speakers. There is nothing, native side (as any other VST), that it's changing when you change speakers. (**) that's A LOT of variables between the two different VST code and presets

When you change the sound pressure, without compensate the volume delta, your ears will perceive the tone differently. Biggr the delta, the wider the difference. It's the Fletcher Munson curve. At low listening volumes – mid range frequencies sound more prominent, while the low and high frequency ranges seem to fall into the background. At high listening volumes – the lows and highs sound more prominent, while the mid range seems comparatively softer. Yet in reality, the overall tonal balance of the sound remains the same, no matter what the listening volume.

The Airturn Duo 200 has BT midi (if it can be programmed), so you could grab a CME WIDI Master for the Helix, and go wireless with the pedal you are used to. Anyway, plenty of options if you go Midi instead exp. (and you don't have to wait for something that probably will never be implemented)

Ah ok. Yes, Helix has a full bidirectional MIDI and Midi Clock, over USB.

Could you elaborate a bit more? Hard to understand what you are asking for...

None of the PCs has slots to plug the casters. I guess you could easily mount something like these instead of the rubber feets, but then you'd probably lose the built in tilt feature;

I believe it's a mix of both, pot value much higher than required, and the way the HX Stomp is sensing control voltage from that TRS, instead the expected TS. That EXP on the back is actually two TS ports (one feeding back to sleeve, and the other to the ring), not a single TRS pedal port. Not even sure how's possible you get it working without the 0/100/0 issue, but yeah, isnt really a ideal setup. Anyway, your pedal has nothing wrong. Is L6 that went completely out of standards with exp pedals. You could easily mod it with a different pot and wiring TS, but this would make it not compatible with other pedals.

Weird question, as it's clearly visible in the official shots... but yeah, it has a small volute. Something like a mid 70 Gibson.

I do often use a HXStomp with a Zoia in the FXLoop, and that in the Fxloop of a helix rack. Im very sensible to latency, but I cant feel anything wrong with that setup, despite numbers on paper. Sometimes it's just overthinking. :)

Unfortunately there is not a dedicated erase command for the Looper. If you loop has been stopped, as soon as you press rec again, previous one is gone and new is being recorded. It's a bummer, but it is what it is. Never tried that myself as I don't use that looper, but maybe you can program a sequence of CCs to simulate a Stop/Rec/Play/Stop. Not sure if this make sense tho, since - as said above - as soon as you press record after a loop stop, it's starting with a new loop anyway. As for the output volume of the loop, you could simply assign the Exp pedal to control the Playback parameter of the looper block. There is not a reserved CC for that, so you have to assign it within the block. I guess you could then save that looper block with the exp assignment as fav.

The stomp wont accept a TRS exp pedal without doing weird things. The TRS it's expecting two separate circuits, that you can set in the globals as exp pedals or footswitches. The dedicated Mission SP1-L6H has a TRS cable because the pedal has a toe footswitch, so its two circuits. Just wondering how are you actually connecting that TRS from the pedal, to the TRS on the Stomp...could be you are hitting 100% way before the end of the pot travel.

Nope.