Schmalle

That is a nightmare scenario. In short: you experienced a catastrophic ground fault. Here is the "fast version" of how your gear probably was destroyed: 1. The Cause: A "Hot" Ground Either your wall outlet was wired incorrectly (e.g., Neutral and Ground were swapped) or the Helix had a major internal power supply failure. This caused the metal chassis of the Helix to carry full AC wall voltage instead of being a safe "0V" ground. 2. The Path: The USB Cable The moment you plugged in the USB cable, you created a bridge. That high-voltage current surged from the Helix, through the thin USB wires, and into your laptop to find a path to the earth. 3. The Result: Total Meltdown The Melted Ports: USB cables are designed for 5V not 120V (240V). The wires acted like a heating element in a toaster, melting the plastic and arcing. What to do now: Test the Outlet: Buy a $10 outlet tester. If it shows a wiring fault, your landlord or an electrician needs to fix it before you plug in anything else. Contact Line 6: Tell them the unit "back-fed voltage through the USB." They may want to investigate such a dangerous failure. Insurance: This is often covered under "Electrical Surge" in renters' or homeowners' insurance.

Deactivate TX MIDI Clock.

What amp do you have and what preamp model do you want to use with it? Maybe we can figure out how to make it sound awesome ;)

https://ph.element14.com/xp-power/ecs65us12/power-supply-ac-dc-medical-12v/dp/1821421 https://line6.com/support/topic/66140-helix-floor-internal-psu-blown-replacement-help-solved/#comment-520474

TLDR, I just wanted to contribute one little known fact to this: Yamaha bought Line 6 in late 2013.

My bad. I was sure it was called Return Level in the Global Settings. But actually it's called Send/ReturnL and Send/ReturnR. Btw: I've repeatedly asked for a "separate Send and Return Level parameters" feature in a future update. Combined Send/Return level pairs (the status quo) can be a limitation in a lot of use cases (4CM with amps, Tonex in the loop etc). Sends and Returns should be treated independently.

True, hence my post. You need to specify the INST setting, otherwise people (with their unit set to LINE) read your post and wonder why their patch is not at all unity gain.

That statement can be very misleading. Consider this scenario: 4CM with guitar -> HX input and HX send -> Amp input 4CM patch with default FX loop block INST as Input Level LINE as Return Level (aka FX loop level) Result: substantially boosted input of the amp, nowhere near unity gain. Solution: set Return Level to INST or -if you need more headroom- use LINE and decrease the FX loop Send parameter to -8dB (value from memory, not exactly sure). More headroom automatically means more noise.

1) Besides the input impedance there is an input gate in the input block. Disable it when you compare the effect of rolling back the guitar's volume pot. 2) If you want unity gain in your 4CM patch (which means the amp's input receives the same level that it would get without HX in the chain) set Input Level, Send/Return and Output Level to INST in Global Settings > Ins/Outs. Use default FX loop block settings in your 4CM patch and crank the VOLUME knob. 3) Here is how you A/B test the actual impact of the HX Stomp to the sound of your amp: HX Stomp has an analog bypass (aka true bypass) that you can use to compare the impact that the HX has when switched in. To do this right you need to do the following steps: create an empty patch double check that the input block and output block settings are default settings set Input Level and Output Level to INST in Global Settings > Ins/Outs set Global Settings > Preferences > Bypass Type to Analog set Global Settings > Preferences > Tap Function to AllBypass crank the (physical) VOLUME knob use a short cable between HX Out and the amp's input Now you can compare the actual impact of the HX Stomp to the sound of your amp toggeling between Analog Bypass and the empty patch using the Tap footswitch in Stomp Mode. 4) HAVE FUN!

There is no default "bypass all" switch / option. You could use snapshots and set up one snapshot with all blocks bypassed. You can do that in Stomp Mode with Command Center.

In Stomp Mode you can program each footswitch. Use Command Center to set up the footswitches to recall the snapshots you need.

I'd suggest to contact support and ask them.

To clarify: those two signal paths are completely separate? You can toggle paths using Controller Assign on fitting level parameters in each path with the same footswitch. I.e. a level parameter in path A is on (0 dB) while another in path B is off (-60 or -120 dB). Or you put a Gain block in each path set at -120 dB and Bypass Assign them to the same footswitch. One gain block is bypassed while the other is active.

No. It should be very easy to fix this for Line6 though. Open a support ticket , tell them that you can't accomplish this right now and hope that they add this in a future update.

This switch inverter device would be used between Helix' Ext Amp and the amp's channel switching socket. It would not be in the (audio) signal chain.