For any experienced guitarists, they may be looking for a way that they can actually change up their sound quality. They should check out how they can use a thimble on the fretboard, which will produce an interesting effect. It can take some practice, because it may feel a little awkward to maneuver this device. But many players will be interested to see what kind of sound they can generate by doing this.
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Use a thimble on the fretboard. Watch this.
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I’m seeking info for sanctuary reverberation absorbsion material ( panels) and best placement.
There may be apps that do that. You can definitely find spectrum analyzers that will measure ultra low.
Is there an APP that can measure the ultra low frequency levels?