Looking For: Passive Summing w/ Phase Invert on 1 channel

[Jabulani Jonny]

Hey guys,
Long time no post, but I have a feeling you guys can help.  I recently purchased a 1975 Gibson ES-355 with the stereo output and I'm looking for a passive summing box that will accept the stereo signal from the guitar, allow a switchable phase invert on one of the inputs, and output a mono signal to run to the amp or to my Helix.  Ideally I'd like the input to be a single TRS stereo 1/4" cable and have a choice of output to a single mono.  Bonus points for allowing me to use a single TRS input and also output as dual mono, using the phase invert to simply flip the phase on one of the input channels.   

There are a few products out there that get close, but end up being more than I want.  The closest is the Lehle P-Split III, which I actually already ordered, but the phase invert switch works on the isolated output, rather than one of the input channels.  The Lehle Parallel SW is a great option, as it allows the switchable phase invert on the input, but it's not passive, which is kind of a pain in the neck if I'm going to run into my Helix. 

The little Saturnworks 2-channel summing mixer is almost exactly what I have in mind, but with a phase invert on one of the inputs, and hopefully just using a Stereo TRS cable from the guitar.     

Does anyone know of a build project out there like that?  I'm happy to build it myself or purchase an existing pedal, if it's out there.  Thanks!

Jonathan

[jwin615]

The blend portion of the ROG splitter blend may work(right side of schem only)
https://www.runoffgroove.com/splitter-blend.html

Could omit the blend pot or keep it as an internal trimmer

[gordo]

I read 1975 ES-355 and everything got kinda fuzzy.  Good score and good to see you posting!

[Jabulani Jonny]

Guess it's not nice of me to post that teaser without a pic.  A quick backstory, I turn 50 in March and for my 50th I wanted to go guitar shopping in Nashville.  I've been watching the Instagram feeds of all the major dealers, waiting on "the one" to come up.  Lo and behold, this came up the Wednesday before Thanksgiving and I was smitten.  Looked at the description and it said a 1975 Gibson ES-355, making it a birth-year guitar, always wanted one.  Albeit a little early, my wife surprised me and bought it for me.  We went up the next weekend to try it out to be sure and needless to say, it's hanging on the wall now.  Below is the pic I saw on Insta, then a pic of me playing it at Carter's Vintage Guitar. 

[jimilee]

Beautiful. I love guitar shopping in Nashville.


Sent from my iPhone using Tapatalk

[gordo]

What a great story and what an amazing looking guitar.  Enjoy that beast every day and Merry Christmas.