7 minutes ago, PeterHamm said:

The manual for Helix makes no mention of TRS at all. I do not know where that info comes from, but the manual states directly that the outputs are TS unbalanced.

Where are the specs in manual? ;)
BTW - Please vote! https://line6.ideascale.com/a/dtd/Specifications-publishingof-I-O-imedances-FS-levels-etc/943915-23508#idea-tab-comments
 

3 minutes ago, PeterHamm said:

Helix LT, Floor, Rack and HX Effects all feature no balanced outputs. Every 1/4" audio connection on those is TS.

Are you sure? The only official spec I found states that 1/4" outputs are impedance-balanced TRS. I know this is not true balanced, but this type of balancing gives fair CMRR and is commonly used nowdays.

You can connect how you like even using TS cables, but XLR at mic level/low impedance is the professional standard on stage. Stageboxes usually do not have any other connectivity.

I am so sorry to mislead you macnevine. No possibility to use traditional expression pedal with toe switch unless you have controller. Let's hope midi exp pedals with toe and heel switches are avialiable soon. In my patch I wanted to show you how to get three EXP pedals out of one existing with hidden toe switch.
Hx Floor EXP pedal tension was discussed here. 

https://seacowcabs.wordpress.com/2018/10/28/studio-pack-collection/

Try this patch to figure out the "freeze" and make some additional routing. https://line6.com/customtone/tone/4123222/

So the answer is 1 like in that video 

I was thinking long time ago of having two or three EXP pedals, but I realized I have only two feet. Stomping on two pedals can be risky too. Believe me - one is enough.

Patch attached: Here how you go with the three amps , two cabs, and three into one EXP pedals. (supply some IRs)

MachoMesoFreda.hlx

There is pad switch on Helix. Some say -11dB.
Vote for metering on ideascale https://line6.ideascale.com/a/ideas/search?templateId=0&query=metering

Yeah, but in hardware DSP devices your computing and storage resources are limited. This is why you have to use IR mixes. What if you mix all cab IRs avialiable on Earth? You will get flat EQ curve with high and low rolloff. :D

Some preamp DSP blocks have serious gain shortage. Lots of them has negative gain when I need to keep them clean. I know I can put booster after the preamp block but I guess a preamp should be positive gain device with its "Master" acting like "Master attenuator".
In the patch I created, Soup Pro is OK. At Gain 3, Master 10 - to get unity gain Channel Volume is set to 4, but Essex, Matchstick are horribly silent and shy. To set them clean I am 6-10dB below unity gain (with max master and channel volume)
HxLT 2.70 firmare. PreGainShortage.hlx

You could be suprised when you try to replicate my experiments. I was.

You don't have to trust your ears. Just connect Hx to some DAW or Host and monitor 7th input. Guitar input is set to have 18-12dB peak headroom to 0dBFS and amp models are ready to be driven with that level.

Helix has true digital bypass and very good preamps and converters, however you can buy/make cheep true bypass stomp with 3PDT switch.

Heel switch for EXP Pedal for Helix II
Please vote!

I have consulted this with my friend. He says shorting R amp to the ground is not safe (when TS is used). So TRS to TRS cable is proper connection.
When paralleling, his advice is to use 0,1ohm, 1W "current sharing" resistors or to short T and R at the speaker TS side. To be sure both amps deliver the same signal it is good idea to place some mono DSP block before output (e.g mono volume).
I found some confirmation on yt:

I have submitted to ideascale the idea of publishing some specs of Helix to get to know the wattage of the headphone amp. If somebody is interested, please vote.
https://line6.ideascale.com/a/dtd/Specifications-publishingof-I-O-imedances-FS-levels-etc/943915-23508?submitted=1#idea-tab-comments

On 11/22/2018 at 9:26 PM, Kingbozo said:

One word.  Rotovibe.

Rotovibe is basically Univibe clone with rate set to pedal.

 

Specifications publishing of I/O imedances, FS levels etc.

Specification like input and outputs impedancies, full scale input levels, maximum wattage of headphones is worth publishing.
 

Yes, it is possible and can be done without reading the manual or watching youtube tutorials.

When people are paid preset makers, why not paid preset repairmen?  ;)

Changing USB cable worked for me. 

I can not repeat your experiment with the same result :( Check my patch.

TwoTteemah.hlx

On 11/24/2018 at 12:19 AM, arkieboy said:

My experience is that a 1024 IR block - which my ears say is more than enough to reproduce the frequency response of a speaker cabinet* - uses less resources than a cab block.

 

*if you dig into the interwebs you can find the physics to back this up.

In marketing texts Cabs are advertised as: Helix HX Hybrid cabs represent a new approach to the speaker cabinet capture process. They provide the same resolution and low-end accuracy as a 2048-point or higher Impulse Response, while only using roughly the same amount of DSP power as a 1024-point IR.
As I understand IR resolution, making more samples IRs helps only with with longer reverb tails. However Cab block has early reflection reverb built in, so making this with IR could actually require 2048 samples IR.
 

On 11/24/2018 at 12:19 AM, arkieboy said:

Moreover, if you have multiple amps in your preset, you can swap out the IR loaded into your IR block on a snapshot-by-snapshot basis.  Which is a huge saving over having two cab blocks.

Thank you for this tip. I did not think about that while building my presets.

On 11/24/2018 at 9:20 AM, Guitarmaniac64 said:

Line6 folk has more or less confirmed that stock cabs is created out of a netrual IR and than they use software calculation aka EQ curve to mimic the sound of the moved mic position backwards in center posistion of the cap that will say we dont have off axis or move towards the edge of the cone like Redwirez REAL IR's has.

I don't belive such a being like "netutral IR" exists. Several companies claimed they have neutral "no mic" IR. Fake. no mic = no IR (in acoustic realm)

On 11/24/2018 at 9:20 AM, Guitarmaniac64 said:

Oh and b.t.w zolko60 when you post an idea on the ideascale thread here on the forum it is meant for the users to find a link of that idea on ideascale as if you post it here with no idea on ideascale (yes i searched for your ideascale and all other new ideas in that has been posted lately and sadly never got it to ideascale) it wont get upvoted.

Iit is a stupid thread that needs to shut down plz MOD lest do it? 

I was not approved on ideascale at the time. It is hard work to find out which idea is already submitted. However if you find any of my ideas worth to be voted, please take it as yours ;)
Speaking of IR's - I would like to have 256 samples IR loader for EQ curves.

Nothing can reset any parameters of anything unless you make it do so. Normal DSP efficient method is to use one DSP block and change it's parameter value (e.g gain) by footswitch, pedal or snapshot.

L6 link is described in manual as "alternative" for AES/EBU output. So my logic tells me they are routed and controlled as "Digital" while they use common XLR connector. I would leave current routing and add a split for "Digital" output to monitor via L6 then...
...but, at two places the maual suggests L6 output is independent of AES/EBU:
"Digital Out Level Sets the AES/EBU output level. Normally, this should be left at 0.0dB." - page 52
"The Global Ins/Outs settings are not necessary for L6 LINK" - page 23. This is curious. If not necessary, so how to route output to L6? Via Multi only?
(I am using Helix LT manual)

If they want they can always show  in this thread. I am not willing to bother customer support with my insane "amp from nothing" project :D Reading of paralleled amplifiers it seems to me that shorting T with R is safe enough. 
Anyway, for my midnight playing needs I have enough power right now. Nobody can tell me now that using headphones or monitors is not what I hear using a real cab;) What I can do is even compare sound of amps I have to their Hx models at bedroom levels. It really interests me however if use of some other amp at the same volume would really be beneficial.
BTW: I was always a problem to get cranked tube power amp sound at bedroom level. Even today a good reactive load box costs 1/3 of Helix LT.