Schmalle

You should have mentioned the fact that the delay is in a parallel path in the op. Bypassing a parallel delay means the blocks dry input signal passes by unaltered. If the block is on and mix is 100% no direct signal passes by. So by bypassing the block dry signal is added to the existing signal on the parallel path and it gets louder. Using the delay in series solves this.

It's probable that your chat program has in it's preferences an option to choose an audio device.

Right, sorry for my sloppiness there. What I actually mean is the level of the digital signal for Out1/2 before it's DA converted and becomes the analog signal on Out1/2. Level destined to Out1/2 before DA conversion: USB/recording level + cut from volume knob position (full = no cut) + Global EQ

Well, DA conversion clipping is obviously wrong. If i.e. your floor monitor lacks bass in a venue it's perfectly fine to adjust to it by boosting low frequencies with the Global EQ. I'd argue that's it's intended purpose - adjusting to acoustic environments. The volume knob doesn't change the USB levels. Analog output level before DA conversion: USB/recording level + cut from volume knob position (full = no cut) + Global EQ Level destined to Out1/2 before DA conversion: USB/recording level + cut from volume knob position (full = no cut) + Global EQ

Or you could use a proper guitar like a vintage Telecaster. Then the Twins default settings are golden right away. ; )

Hopefully Line6 will some day learn that documentation should not be considered optional. But they are in the business for over 2 decades now and some things never change.

There are lots of amp models that can do clean. All kinds of clean. The Studio Tube Pre is one option for a clean preamp.

Helix is a USB sound device aka sound card. It's headphone jack doesn't support mic in from headsets. On Windows 10 click on the volume icon on the right side of the task bar. Click on the arrow on the right top to select the audio device. This arrow only appears if your system senses multiple sound devices.

The amp's FX loop supposedly has bypass according to https://www.jrrshop.com/panama-fuego-15-head-amp-figure-mango You might investigate whether that's true and if that might cause the problem.

No. It depends on the strength of the alternating electromagnetic fields that are introducing noise. Longer cables only increase the probability of picking up noise by such sources.

As stated in the thread you started TRS vs TS has no effect on sound. It only prevents added noise.

When linking the HX Stomp with the Headrush a TRS cable prohibits added noise along the cable caused by electromagnetic fields. It also brings the possibility to lift ground which eliminates hum introduced by ground loops. There are no settings to enable/disable this.Technically it's always on, but it has no effect on TS cables since the ring is shorted to ground in that case. TS vs TRS does not change the sound as stated by @rd2rk.

To communicate my observation as clear as possible: the only thing I had to adjust to replicate the behavior you described was to slightly adjust either the HX volume knob or the amps gain knob. I wish you a successful search!

Are 4 cables connected like this? 1. guitar -> HX input L 2. HX send -> amp input (or pre in) 3. amp effects loop send -> HX return L 4. HX out L -> amp effects loop return

I had a look at the patch and could replicate the phenomenon. It's gain staging. The way you have set the distortion is with boosted mids but less bass and treble. Whether the engaged distortion sounds louder or less loud depends on how close the clean amp is to saturation levels. The mid scoop of the amp's tone stack will equalize/lower the mid boost of the distortion pedal. Depending on whether the input stage of the amp gets into saturation it reacts differently to this mid scoop: Set it on the edge of breakup and the mids saturation level is lowered, but not the mids volume level. Set it clean with headroom and the mids volume level is lowered.

Here is a great resource on equalization.

Title says HX Effects.

Export the patch in HX Edit and attach the file here in a post.

No idea, but if you post a patch we might further investigate. Which mode do you use? Stomp, scroll, preset, snapshot?

Guitar volume, tone, split pickup and loose connection come to mind as possible causes.

IRs are usually normalized so that they are (roughly) as loud as they can get. The AxeFx cab block default level is 0dB.

Not really. There are computational limitations. IR's in the Helix can be max 2048 samples @48kHz which is 43ms long.

I think the AxeFx III is state of the art for this stuff atm.

The description of the video states where it is available.