Recap.
You asked for a solution to an unusual problem.
I explained why MIDI won't work, and suggested a possible, though expensive, solution (that was me, not phil).
I set up a test to simulate using a single exp pedal to control two gain blocks using my HX Floor (again, that was me, not phil), and reported the results, which were inconsistent, and advised that it would be an expensive experiment. I asked, out of curiosity, why you were using two LTs. You replied:
That struck both myself and phil as strange, since it's a problem that most of us resolve within the 8 block confines of an HX Stomp using EQ and IRs.
You then ADDED:
Fair enough.
You proposed using a couple of cheaper solutions. I then researched the EHX, which MIGHT work. I can't test the Y-cable thing because I don't have an outboard exp pedal.
As for CV Out, from page 9 of the HELIX FLOOR Manual:
"CV/Expression Out - Connect to the expression pedal input on stompboxes or CV (Control Voltage) input on vintage pedals or synths."
That indicates to me that it's sending a variable voltage which I wouldn't want to risk connecting to something that doesn't specifically call for it.
But then I'm no electrical engineer either.
Also, per the LT Manual's back panel diagram, the LT doesn't have a CV out.
Having already reported inconsistent results using a similar configuration (single exp pedal), I replied truthfully, in what I thought was a humorous manner.
You apparently took offense. I'll not apologize for my sense of humor.
Bottom line, if it's that important to you, you need to take a risk on a POSSIBLE solution. How much you want to invest in the experiment is up to you.
I've done all I could for you, researching two pedals, reading manuals and conducting an experiment to test the theory.
DEMANDING that the conversation be taken off-line because I haven't followed your rules as "Owner" of the thread, and haven't provided a positive solution to your unusual problem using HW that I haven't personally used, is, frankly, unreasonable, rude and offensive.
More importantly, the purpose of this forum is to provide a space where USERS (none of us work for Line6) can help other users. IF you find a solution to your UNUSUAL problem, I HOPE that you'll be considerate enough to report it here, so that it might be helpful to others.
Good Luck in your quest.
I await your report on the ultimate solution.