The Hammer Jammer, a new percussive device, can be installed on six-string electric or acoustic guitars to enhance the sounds produced by the guitar. A recently posted video showcases the fast hammering techniques and unique sounds the new $30 device produces. Another video provides instructions on how to install the Hammer Jammer on a guitar.
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New Percussive Device for Electric and Acoustic Guitars.
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?
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