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4 Cables will get you MONO, 5 will get you Stereo. Do everything a 4CM tutorial will suggest but instead of a single cable going from the LT output to the Amp return, you need to run both the LEFT/RIGHT outputs on the Helix to the LEFT/RIGHT Returns on the amp.

Use Snapshots to control what's happening on the TAE, and which HXFX effects are ON/OFF when you load the preset, parameter changes of the FX, etc.. Use the stomps to turn effects ON/OFF on the fly, and control parameters not already being controlled by Snapshots - a parameter can only be assigned to one controller (snapshot or stomp) at a time.

So I'm still not so sure I understand you yet. I think English may not be your first language and there may be a translation issue but that's OK. Not a problem. The big thing I don't understand is how you want to listen to this. Did you want to hear both the Helix and your backing track through the computer's speakers or through the Powercab? Another thing you mentioned is that you want to be able to only turn up the backing track from the headphone output. I see no way to do this particular thing. I'll start from scratch and assume that you want to hear the backing track and your guitar/Helix from the Powercab. I am also assuming you have the Powercab and not the Powercab Plus which has the L6 Link feature. There are two ways to do this that I can think of to hear this through your Powercab. The first way is to use the Returns on the Helix. One thing the Helix lacks is a dedicated stereo input for exactly this kind of thing. The way to get around this is to use Returns on the Helix. You have four returns that are all mono. BUT you can place a Return block that is stereo in your patch path. The stereo return blocks use either inputs 1 & 2 or 3 & 4 for it's stereo signals. So you will need to split your computer's headphone output to two mono outputs with a cable like this IF your computer has the headphone output I'm thinking of. https://www.amazon.com/Monoprice-Inch-Male-Dual-Cable/dp/B00DUL1UT6/ref=sr_1_6?dchild=1&keywords=1%2F8+TRS+to+two+1%2F4+mono+cable&qid=1631889289&s=musical-instruments&sr=1-6 The 1/4" mono cables would go into your 1&2 or 3&4 Return inputs depending on which Stereo Return block you used. So you would put the Stereo Return block in as the last block in your chain. You can then control the Helix/Computer mix several ways. The Stereo return block has two parameters. The first parameter is called RETURN. That's the level of the computer's audio going into the Helix. The second parameter is MIX. That will adjust the blend/level between the Helix's and the Computer's audio signals. The third way will be the easiest way I think and that's just to use the computer's own volume level to adjust that. Setup your Return's RETURN and MIX parameters for one song on your computer and then leave that and just turn the computer's audio up and down as needed. Now, like you said, the Powercab is mono and right now your signal is stereo so I would then put a mono block of some kind in after the Stereo Return block and before the output. Just a mono Gain block right before the output will do the job. The BIG hassle with all of this is you have to put a Stereo Return block into EVERY patch you plan on playing the computer along with your Helix. That's the biggest hassle. The other way involves audio over the Helix's USB connection. This method involves a whole set of different issues one of which is making your Helix the sound card for your computer so before I get into that mess let me know if what I just posted was even close to what you want to do. If you want hear both the Helix and the computer audio through the computer's speaker let me know. Really, the easiest way to do his is to just get a little 4 channel mixer and a couple of powered speakers plugged into the outputs of your mixer. You can even use some cheap computer speakers for this. And you can go stereo. Hope all this helps. Good luck!!

Right. Try connecting your guitar to the FX Loop Return/Aux input. Use Global Settings to make sure this is set to Instrument level input. Place the Return block at the beginning of your signal flow. If the noise disappears you likely have a hardware issue with the Guitar input jack.