I have another thread here: http://line6.com/support/thread/89396?tstart=0

Please see also this site I am NOT the only person having problems http://line6.com/support/thread/89814 

Well it appears that you have no logical answer to this problem and I see that in my line of reasoning i.e. I have made a typographical mistake i.e where I put "BUT your line of reasoning doesn't explain why if the F played on the B string doesn't cause the same effect on the open G as does the G string played on the B string" I should have typed "BUT your line of reasoning doesn't explain why if the F played on the E string doesn't cause the same effect on the open G as does the F string played on the B string" Also on my line of reasoning sentence starting " "Interestingly enough if you keep the same guitar and amp volume positions but turn the settings knob to the standard position there is no trace of the discord whatsoever when play the F or G note on the E string"" The strings are not retuned i.e. in the open G chord only the top E string is detuned down to a D the other strings i.e. the B, G, and D remain the same. The problem is patently with the electronics. So I am sorry but you have not diagnosed and correctly characterized the root cause of the issue that is inherent to the physics of the JTV guitars, this does need further investigation and I think that you know as well as I do that this is the case but you are trying to fob me off with an explanation that does not hold water. Regards Brian.

Hello,  The previous customer that updated the guitar and said this removed the issue was most likely describing a different problem as his explanation of what he was experiencing was not very clear.  It was likely a different issue.  From your last response:  "BUT your line of reasoning doesn't explain why if the F played on the B string doesn't cause the same effect on the open G as does the G string played on the B string"  - Yes it certainly does: The F played on the B string in “Blues G” tuning is not retuned (the B string is tuned to B in that tuning) this it sounds, and vibrates mechanically as an F. Since the main offenders for exciting sympathetic vibrations are the second and third harmonics (the octave of the note, and the octave of the notes 5th), playing an F (which does not share those relationships w/ any open string) is unlikely to produce a similar issue against any of the open strings, and even if it did excite one of the strings, the lack of “virtual” retuning on the B string would likely not lead to the same ‘rub’ in the sound.  "Interestingly enough if you keep the same guitar and amp volume positions but turn the settings knob to the standard position there is no trace of the discord whatsoever when play the F or G note on the E string"  - Removing one or both of the conditions necessary to repro the issue (fretting a note which causes an open string to resonate AND having either the fretted or open string retuned down a major second) will remove the issue. This is expected.  "I detuned the E string down to D and tried playing the same notes both on the guitar using both the magnetic pickups and the electronic system neither of which exhibited the discordant problem"  - Your instinct is in the right direction, but the testing is different... The correct repro with a physically retuned string is to excite the harmonic by playing at the 5th fret on the retuned high string until the G string rings a bit THEN to play the F note at the third fret. An easier way to simulate the issue is to play a harmonic on the twelfth fret on the G string (which is the harmonic being excited in your previous case) and play the F on the high E string (at the third fret if the string is detuned to D).  The issue will be slightly less severe on the mags but can be repro’ed in the above cases.  To the best of our knowledge, we have diagnosed and correctly characterized the root cause of the issue that is inherent to the physics of the JTV guitars.  This is their nature in their current state.  We have identified this and will use this info for future updates or changes to the JTV guitars.  Regards,  Line6Hugo

Hi Hugo, I can see the point that you are trying to make in respect of the harmonic relationship of these two notes and yes the muting of the G string whilst playing the E string on the third fret ( i.e. the F note) does in fact stop the discordant note as does the muting of the D string when playing the G (5th fret) on the E string BUT your line of reasoning doesn't explain why if the F played on the B string doesn't cause the same effect on the open G as does the G string played on the B string. Interestingly enough if you keep the same guitar and amp volume positions but turn the settings knob to the standard position there is no trace of the discord whatsoever when play the F or G note on the E string which if your theory was correct the sympathetic resonance would still occur. The problem appears to be in the programming of the electronics in fact to prove a point I detuned the E string down to D and tried playing the same notes both on the guitar using both the magnetic pickups and the electronic system neither of which exhibited the discordant problem. The fact that your other customer by re-installing the flash memory gave some improvement would support my reasoning having said that I have tried this with no improvement. So Hugo as we say here in England nice try but no goldfish , regards Brian.

Brian,  What seems to be going on here is that mechanically, the strings begin vibrating due to the principle of sympathetic resonance, so, when playing the 3rd fret on the high E string, the G string begins vibrating  Can you try something to confirm something for us?  When the “bad sound” happens, does muting the G string w/ a fingertip stop it?  Regards,  Line6Hugo

Brian,  This is still a problem we are looking into and thus far we have one customer who was experiencing a similar problem and says that re-installing flash memory on the guitar help for him.  As mentioned we are still verifying this and will get back to you when I have an update.  Regards,  Line6Hugo

Hi Hugo, I don't appear to have any update on this matter since the 10th December or any answer from my last message, regards Brian Berry.

Hi Hugo, any developments yet? is it only the JTV 59 or is it on other models as well? Would it be a good idea if I ask other users via Facebook and You Tube if they are experiencing the same problem and if they have come up with a solution, cheers Brian.

Brian,  Thanks for you reply.  We will be spending a little more time investigating this and I will let you know when I have further news.  Regards,  Line6Hugo

I havent got such a program or facility to do this but on your log of the 6th Dec you say you get similar or probably the same results as what I am getting so I don't see what this will achieve. I am sure though that you have the facilities to do just this as have the technical department at Rugby. If you refer to my original complaint the technicians at Rugby got identical results with their guitars as with mine. Please ask the QA team to carry this out themselves or can you send me details of which program they expect me to use, many thanks Brian

Hello,  Our QA team has requested if you can provide us with a DIRECT recording of this with NO microphones involved, meaning, plugging direct into a recording program and recording the audio while monitoring the audio through headphones.  We want to check if the problem occurs in this particular scenario as well.  Regards,  Line6Hugo

Hi Hugo, I get this problem at low or high volume. When I went to the Line 6 premises in Rugby they initially though I was hearing the un-amplified harmonic but we tried it through their Line 6 amp at various volumes and at various distances from the amp with similar results. We then tried one of their 59 guitars with the same results. They then tried another guitar in their lab again with the same resultsI have now tried using the headphone socket from my amp and can still hear this harmonic distortion. The recording was made on a HTC HD desire phone. Hope this help, regards Brian.

Hi Hugo, I get this problem at low or high volume. When I went to the Line 6 premises in Rugby they initially though I was hearing the un-amplified harmonic but we tried it through their Line 6 amp at various volumes and at various distances from the amp with similar results. We then tried one of their 59 guitars with the same results. They then tried another guitar in their lab again with the same resultsI have now tried using the headphone socket from my amp and can still hear this harmonic distortion. The recording was made on a HTC HD desire phone. Hope this help, regards Brian.

Also, can you tell me how you recorded this audio?  I can get similar results if I let all of the other strings ring out when playing the same notes that you provided while in the BLUES G tuning on a JTV guitar here.  So far this sounds inherent with the JTV guitars.  I will test a little more to let you know what I find.  Regards,  Line6Hugo

Hello Brian,  Is this a problem that happens no matter what type of gain settings you are using?  Also, if you were to monitor in headhphones or at low volume, do you get this same sound/harmonic?  Regards,  Line6Hugo

File attached regards

blues g tuning compared with standard tuning.wav

Hello- Can you please attach the audio file you mentioned in this ticket.