Schmalle

No. The unmuted tuner bypasses all processing.

No. You need an external tuner for that.

Ok. The Moog EP-3 isn't suited because it's potentiometer is 50 kOhm. You need a linear 10 kOhm expression pedal. If you have multimeter measure the resistance between tip and sleeve. It should go from 0 Ohm heel to 10 kOhm toe with 5 kOhm half way. If it has a TRS expression out you need to get rid of the ring signal which is the inverted tip signal (heel 10 kOhm ... toe 0 Ohm). You can do by using a TRS cable. The ring won't trigger the FS4 function. If you use a TRS expression output with a TS cable you'll notice weird control properties: it will go from heel=0% to middle=40% to toe=0%.

In the Settings View set Pedal Jack to ExpFs4.

I can confirm that the patch does exactly what you described IF no cable is connected to Return R. HX is auto-merging channels when you use the left input or left return only it is internally distributed to the right channel. In other words: by unplugging from the right return the Return R block effectively becomes a Return L block.

I see you use Mix 50% on Path B's Return R block. That should be 100% unless the Split block is set to Split A/B with RouteTo set to A100. Otherwise the guitars 1 and 2 bleed through. Also you don't need to use the Send block: select the Mixer block, press Action and select Path B. If that doesn't help: post the patch.

It's probably assigned to the 1 Switch Looper. Go to Bypass Assign and unselect FS1.

Make sure to set Global Settings -> Ins/Outs -> Return Type to Return.

Why are you posting a preset where I have to figure out what I have to switch on / off to get what you are doing? -Waste of time. I'm out.

The ABB patch has a parallel Minotaur (mid boost) before the amp.

No, unless you do the loop back trick: send expression pedal CC#4 data (Command Center) via MIDI OUT to the other MIDI controllers MIDI THROUGH so it comes back as external CC to Helix's MIDI IN. But: CC#1...CC#3 emulate the Expression pedals; can't you use these instead of CC#4?

The Output Block is what you found at the end of the chain which says "Main L/R" . It has two parameters: Pan and Level. Make sure Pan is set to Center.

...and erase that assignment again by pressing ACTION and said parameter knob.

The most likely causes that come to mind: output block panned hard left or right using right input for your guitar

Most likely caused by an ungrounded signal chain. Try plugging into a grounded device. E.g. connect the HX's Out with an amp [that has a 3 contact mains plug] - you don't need to turn the amp on.

Sure, it's about signal levels. Digital gear has A/D and D/A converters that can only handle a certain signal level without clipping. So you need to make sure you don't clip a digital input / output. But on the other hand you don't want to waste headroom because that lowers the signal-to-noise ratio. HX let's you choose between two sensibilities / signal levels: INST and LINE. LINE Outs put out a higher level compared to INST and LINE Ins can handle a higher level which happens to be 8.5dB in my tests. With your setup you want high sensibility for HX's guitar in and you want to send it without amplification to Amp1 in. Usually that means using INST level for the input and the send. But you can also use LINE and compensate by lowering the send level manually. In your case LINE has the benefit of using low sensibility for the signal coming from Amp1's send which seems to be quite hot. Selecting -10db loop level on the Amp1 has basically the same effect: it lowers the signal level that the HX has to handle. The +4dB and -10dB are *roughly* equivalent to HX's LINE and INST levels - hence my original advice to use -10dB and all INST, but that was just a starting point that usually works. So why did you notice it on the clean channel? -Clean sounds are more dynamic (louder peaks) so you hear it causing an fx loop device to clip earlier than a crunch channel with the same perceived level. And crunch sounds already contain clipping artifacts/overtones which also makes it harder to identify additional clipping. Have fun!

Try Send/Return and Output Level to Line. In the FX Loop block lower the Send Level to -8.5dB to manually send with INST level.

I feel like chasing a moving target. We need to separate this into two problems and tackle them one at a time: HX before the preamps and HX in Amp1's loop. If we have found a solution for each you can combine to 4CM. How old is the HX? Do you have a problem with only the Amp1 and the HX in 4CM? If so: where? This seems like a contradiction. No difference in volume but pushes the clean channel more?

But that might clip the HX input hence the -10dB recommendation for more headroom. This might explain the slight distortion on a clean tone.

Confirm that you are using serial FX loop mode on the Amp1.

Ok, that's nice. Without the HX, if you switch to +4dBV loop level there should be a 'weird level jump', right? At least you have to crank the Victory's master to hold up with Amp1's preamp in this setting. So let's settle this: the -10dB setting works better with the Victory. I'd go on and evaluate the amount of 'tone suck' by adding the HX after the preamps only: Guitar -> Victory input Victory through -> Amp1 input Amp1 send -> Victory loop in Victory loop out -> Hx input HX out -> Amp1 return Now use an empty preset, set Global Settings -> Preferences -> Bypass Type is set to Analog (aka true or hardware bypass). Now you can check if or how much 'tone suck' there is after the preamps by toggling back and forth (press MODE and Tap) between the empty preset with and the hardware bypassed HX). There should be no jumps in level between bypassed and unbypassed (given input and output levels are set to INST). After that do the same but before the preamps: Guitar -> HX input HX out -> Victory input Victory through -> Amp1 input Amp1 send -> Victory loop in Victory loop out -> Amp1 return This will be more obvious of a change because you'll hear added noise especially with gain because the preamps (massively) amplify the noise. That unfortunately is the downside of putting stuff in front of a preamp. With the full 4CM: Does bringing the mix parameter down in the delays and reverbs help?

The idea is to use the two FX loop blocks 1 and 2 as two preamp loops: you either use one or the other, either Amp1's preamp or the Victory by selecting which loop you engage. We should be able to get this going. Let's start without the HX: Guitar -> Victory input Victory through -> Amp1 input Amp1 send -> Victory loop in Victory loop out -> Amp1 return Using Amp1's -12db loop setting: does the Victory work with just the Amp1 this way? Can you comfortably get the levels right between the two preamps? Does the connected but bypassed Victory add level compared to just the Amp1 (disconnected Victory)?

Why do you cascade the preamps? Try this parallel wiring instead: guitar -> HX input HX send 1 -> Amp1 input Amp1 send -> HX return 1 HX out L -> Amp1 return HX send 2 -> Victory input Victory output -> HX return 2

Yes. The -10dBu setting provides more headroom for the HX to operate. All HX levels to INST provides unity gain.

+4dBu and -10dBV are two signal levels - studio rack vs. fx pedal gear. Amp1's fx loop is unity gain: the return compensates the send level so that the level the power amp gets is the same if you use no loop, -10dBV or +4dBu. If you use a different preamp however you need to manually compensate for the different return levels by adjusting the preamp's output level. Since Amp1's send level is much lower with the -10dBV setting I'd suggest you use that. I recommend to set ALL levels to Inst in the HX - contradicting @rd2rk's advice which would boost the level in the Amp1's fx loop but you want unity gain (same level as bypassed).