rbum Posted January 13, 2017 Share Posted January 13, 2017 Ob boy! After the update to 2.12 it seems a bug from 2.00 returned ?! Usally I have my "guitar in-z" set to 10k. This value is SHOWN when a preset is selected. So far so good. But now it is WHITE, as if I would change it during snapshots, which was not the case in 2.10. AND as soon as I go to another snapshot, the shown value changes to "Auto" - though the sound does not seem to change... Returning to the first (or any other) snapshot, the value continues to be shown as "Auto" - it does not affect the sound. I tried to upgrade my presets to the latest format with Power on while holding 10 + 11 but the unit says "rebuilding all presets" instead of " upgrading all presets..." At the moment I cannot even judge, if the shown value is the used value.... it seems as if changing guitar in-z has no effect whatsover on the real input - the sound does not change at all! Some else finds the same behaviour ? Quote Link to comment Share on other sites More sharing options...
zooey Posted January 14, 2017 Share Posted January 14, 2017 Not at my Helix, but is there a global setting for whether input z is global or per preset? If so, did you put back your global settings after upgrading? (Has to be done manually, they can't be exported or imported.) Quote Link to comment Share on other sites More sharing options...
jbuhajla Posted January 16, 2017 Share Posted January 16, 2017 Guitar input Z doesn't seem to be a global parameter. Quote Link to comment Share on other sites More sharing options...
zooey Posted January 16, 2017 Share Posted January 16, 2017 Maybe what I'm remembering is that it used to be global, but a semi recent update made it per preset. Carry on. Quote Link to comment Share on other sites More sharing options...
rbum Posted January 16, 2017 Author Share Posted January 16, 2017 No, it WAS global, but that changed in 2.00 to "per preset / snapshot" and default "auto". But it did not work properly, showing the wrong values. This was an admitted bug and was fixed with 2.01. But now in 2.12 in my Helix, if I change the value, it seems to have NO effect on the impedance - at least I can hear no difference. Maybe someone can just check this by changing the value from the default "auto" (which is 1M Ohm in most cases) to 10k Ohm. The sound should become less aggressiv or distorted if you try it with a high gain amp. For most usres this may be without any use or relevance but because I use some guitars with "hot" pickups like PRS P22 and some with single coils or Godin xtSA & a GR55 in the same song I have to adjust the impedance to get equal volume levels. And at the moment it's like the block is without function... Quote Link to comment Share on other sites More sharing options...
amsdenj Posted January 17, 2017 Share Posted January 17, 2017 You wouldn't use impedance to get equal volume levels, that's what the pad switch is for. Impedance should generally be very high for passive pickups, less critical for active pickups. However if you want to faithfully reproduce certain pedals, you need to use Auto so the impedance is set to that of the pedal. This pedal has to be the first in the signal chain after the input block through for this to be effective. Personally I use 1M all the time. It keeps the guitar loaded properly so that you don't loose high frequencies. Quote Link to comment Share on other sites More sharing options...
rbum Posted January 17, 2017 Author Share Posted January 17, 2017 amsdenj, you may be right in general - but I experienced some different behaviour in my setup. All my guitars have (active) piezos and - so I was told - rather high gain pickups. As I run them seperated into Helix (piezos: return 1, pickups: guitar in) but together out to Pa & Stagescource L2t, I have experienced that the 1M brings exactly too much high frequencies from the pickups (for my taste) when distortion is used. Plus the piezos of the RPS are "weak" compared to the pickups, so I would have to rise their level dramatically and lower the pickups in every preset I use them together ... so it was easier to fix this by reducing the guitar-z level (and for me it was good when it was a global value before 2.01). However this worked good for more than a year. Anyway, something changed with this update and the only question I would like to have an answer to is: does changing the guitar-z values has any effect that can be heard in your Helix or is it so subtile that it does not matter? Maybe my unit did behave "wrong" before the update by reacting very active to changes of this values between 10k and 1M .... ? Quote Link to comment Share on other sites More sharing options...
amsdenj Posted January 18, 2017 Share Posted January 18, 2017 @rbum, you may find better results keeping the impedance matched with your guitar and using cabinet or IR low and hi-pass filters to tailor the tone, or use an EQ if you needs something more flexible. That is, get the most from your guitar, then adjust from there rather than throw thing away right at the start that you can't get back. That might provide more flexibility, especially using snapshots. Quote Link to comment Share on other sites More sharing options...
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