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can you tell if there is a wire broken? if you know how to use a vom meter you can check to see if you have continuity if you don't then you have a wire problem & make sure that your battery is good.
1. Do nothing and live with the occasional problem.
2. Check your guitar cable and the battery connections for loose or intermittent connections/noise. Try to see if it's the amp responsible for the noise....ie, Is it caused by vibrations, or maybe static....especially in winter when it's dry. Your home power may have noise on the line, so borrow or rent a power conditioner which filters out noise. If that fails, go to 3.
3. Bite the bullet and pay a competent guitar tech/luthier to repair it. Most of these issues are due to loose/faulty connections. Should be less than an hour. Hey....It's a Martin.
3a. Pay a guitar tech to loosen the end pin connector so you can see if you can repair it yourself.
If you purchased your Aura separately from your guitar, then that is definitely an issue. I have no suggestion.
HOWEVER
I thought I had this same "problem" with my onboard Aura on a DC-16RGTE. It's not actually a problem. The onboard images are images of the actual guitar model you own. You can't change them to other guitar images. You can only change the EQ settings by editing each image. Your guitar is your guitar - images & all.
If you are in the US, take a length of light-gauge wire (AWG 20-24) attach it to the center screw that keeps the cover on over the standard dual AC receptacle and to a screw on the back of your unit.
This kind of problem often is caused by a poor grounding of the cover or chassis.
It is possiblle that the sudden pulse from the pickup due to tapping is saturating the input of your amplifier, and that is what actually kills the signal. Try this into a different amp as a test. Once you do the test I can offer some suggestions to try.
Its possible that if you changed strings the saddle might have changed position in its slot. It has to sit uniformly on top of the piezo element in order to work properly. Try testing the pickup(piezo element) first before suspecting the preamp.
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