Input to Tuner - where does it come from?

EdRaket · Apr 15th 2016

I guess this is one of those questions that have a simple answer, just can't figure it out myself.
When I go into tuner mode (by pushing my volume pedal to heel), the tuner works as expected. At the same time the sound is muted. Fine.
Now when I mute all strings of my guitar with my hand, while being in a room with lots of noise, my tuner signal jumps in all directions. It seems to react to the noise in the room.
It looks like the tuner picks up s sound signal from another source than my guitar. Uh? Where does it come from? Is there also a microphone in the Kemper that picks up noise?
When I hit a string, tuner acts normal.

Now it is not a problem in itself, but I am curious to understand what is happening here.

Thanks for your support.

Best regards,

Ed

viabcroce · Apr 15th 2016

There's always a certain amount of random noise coming from a guitar, the room is not silent EM-wise. Also, consider that the contact with the hand is not rock-firm and generates noise in itself.
The tuner senses a "signal" and reacts, the "note" it marks is random and depends on how the algorithm has been written.

paults · Apr 15th 2016

And, 50hz and 60hz are likely below the range of the tuner, so any stray noise from voltage could be a harmonic that is "in between" notes.

I have no idea whether the above paragraph is actually true or not, but if it is quoted enough times, it will become virtual truth

viabcroce · Apr 15th 2016

Well, if the Profiler can tune a bass the tuner must be able to at least sense 40 Hz (lower E), if not 31 (lower B).

paults · Apr 15th 2016

Another virtual truth bites the dust.

viabcroce · Apr 15th 2016

"The road to Enlightenment is paved with virtual truths" (cit)

Michael_dk · Apr 15th 2016

Turn the guitar's volume knob all the way down, the jumping should stop Actually, the bubble completely disappears

EdRaket · Apr 15th 2016

Quote from Michael_dk

Turn the guitar's volume knob all the way down, the jumping should stop Actually, the bubble completely disappears

Hi Michael, that is also a good suggestion. I will try that. Somewhere I also read something about a automatic tap sensor on the Kemper and thought it might come from that direction. Thank for all the suggestions.

Sharry · Apr 15th 2016

Quote from EdRaket

Now when I mute all strings of my guitar with my hand, while being in a room with lots of noise, my tuner signal jumps in all directions. It seems to react to the noise in the room.

When I turned the Guit Volume to zero - this effect disappear after approx 2-3 seconds on my Kemper.

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