I searched for other similar topics but the ones I found focused on why people do or don't like the Helix onboard tuner so I didn't think it was appropriate to post this in line with them.
I just bought the Helix and wanted to share this since some people who loved their Peterson may find it useful. BTW: I think this is my first post. I hope I'm not breaching any protocols.
I would add: I am not mechanically or technically minded, this is all based on my casual observations the past 40 years and while I have been playing a long time, I am only a bedroom rockstar who loves gear.
I've attached a few pics...
I have been using a Peterson Strobo Stomp tuner for a couple years and it is my favorite because of its "Sweetened Tuning" setting for guitar.
This helps me because all my life I've noticed that even if I tune my guitar to perfect pitch on all 6 strings, some chords still ring with dissonance. I also noticed the dissonance was always related to the inclusion of the G or B strings. I'd learned to work around it by doing a micro-bend on one string or the other to bring the chord into pitch.
This dissonance can happen because it's a poorly built guitar or has not been set up correctly but it still happens on a quality guitar with a perfect setup. I believe this is because of inherent imperfections in the way fretted guitar design was standardized way back when but that's another story right?
Despite my lifelong passion for guitar I (inexplicably) never knew about having guitars set up properly until about 10 years ago. While this has made a huge difference in how much I enjoy playing my guitars it still did not completely correct the dissonance issues for me because I always rely on tuners telling me when the string is perfectly in pitch.
When I set the Peterson tuner for sweetened guitar, it takes into account the imperfections in the longstanding design of guitars and shows me the offending strings are in tune when they are really just a smidgen out of tune. Peterson figured out a useful way to combat this heinous aural crime so I no longer need to do micro-bends to correct the issue!
So... Where does the line 6 helix come into this? I love this device but was disappointed that I would still need to use my Peterson tuner when I had this big beautiful all-in-one pedalboard with a brilliant display and a great looking tuner mode. Then I read the Helix manual from front to back. The Helix tuner does not have sweetened tunings but it does allow you to offset each string by a specified amount. This text was taken from the Helix Manual: "String offsets calibrate the tuner so that these slightly out-of-tune pitches appear as in tune."
After reading that I cabled up so both tuners would show my string pitch and tuned up using the Peterson. Then I changed individual string offsets on the Helix so they would appear in tune on its display.
Thanks to Line 6's design considerations, I taught the Helix how to do the same thing my Peterson does and now I can omit the external stompbox from my set up!
If you still want to use your external tuner with your Helix there are a few ways to hook it up after your signal path. One of them is: With the tuner activated you can specify the tuner outputs to "send 1/2" or "3/4" so when you activate the tuner, you are still seeing the tuner on the Helix display but also using your own.
I hope this helps someone who hasn't made it all the way through the manual yet :-)