Re the video:
Helix has a variable input impedance selector. Pod Go has a fixed impedance of 1M Ohm. If he had Helix set to 'Auto' I'd be interested in a comparison using the other impedance setting in Helix.
For those less familiar, placing a buffered unit in front of Pod Go will deliver the same highs. A buffered unit might be eg any Boss stomp pedal - the pedal has to be powered but not stomped 'on' to benefit from the buffer. The other buffered device could be something like the Line 6 G10 Relay wireless system that is a buffered device. I use the G10 Relay, so do not have this issue, and is why similarly the Pod Go Wireless doesn't have this issue ie it's an issue ONLY when using cables.
However, it is also very much down to the make, length & type of guitar cable you are using because different cables have different impedance, that can make a big difference to your tone. I tested my Pod Go with a good quality Vox coiled cable and my Piranha cables and the tonal difference with both as compared to via the G10T or placing my Boss CS3 pedal in front of Pod Go, was negligible and nothing like the variation in this video, which is quite extreme.
Now, whilst there has been a lot of posts on forums/boards/youtube vids on this issue, you need to appreciate that putting a buffered unit in front of ANY MFX unit will brighten tone and not until you hear the difference do you think anything is 'wrong'. now, although Helix offers an impedance selector, a 1M Ohm input impedance is standard in mid-range MFX. Even the brand new Boss GX100 is 1M Ohm, whereas it's big brother the GT1000 is 2M Ohm. So this is not a 'fault' with Pod Go, but an additional option in Helix that is 3 x the price.
I have a Vox Tonelab SE, LE and ST - and the same tone brightening occurs when using a buffered device in front of these. I also have a BBE Sonic Stomp Maximiser, and this makes tone sound brighter/clearer too. The same issue applies when using a guitar amp if you plug direct into an amp and then compare with a buffered device in front of it.
So, whilst there is a tonal difference, it's because of the more sophisticated impedance options in Helix, rather than an issue with Pod Go Impedance. And here's a further thought. Many of the more expensive wireless devices allow you to change the settings to replicate guitar cable impedance. Why? Because a lot of players don't like the brighter tone, and want it to sound similar to their cabled sound.
This whole thing has just got a bit out of proportion. But whilst it's possible Line 6 might be able to do something in v1.40 firmware, I suspect only a physical mod would 'solve' the issue for those seriously troubled by it - but you never know.
However, having said all this I still would have hoped that Line 6 would have said something to at least confirm Pod Go impedance definitely is 1M Ohm. The fact they haven't even done so does potentially raise a big question mark and could give some credence to (reportedly) 'techs' who say they have tested Pod Go and found the input impedance to be only a third to a half of 1M Ohm. If that is proved to be the case then it might suggest Line 6 may have cut corners to save a few pennies. The problem is that if Line 6 refuses to comment, customers and potential customers are left to speculate, and that's not a good thing.
So Line 6, if you are looking in - please confirm what the Pod Go input impedance is.