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I imagine a large 6 inch pipe with various sizes of surgical rubber tubing stretched across tin inside. with air blowing though it strumming the rubber cords. kinda like a large woopee cushion ,well sorta A sub woofer would be more practical though.
on another note, ever run the edge of a pick down your guitar stings? a large wound bass string strung tight with something scraping down the edge at the right speed might give a growl.
now imagine a a 4 foot section of 4 inch pipe set up like a slide whistle with a piston type thing that runs up and down with a heavy bass string stung through the center. the piston has a spring loaded scraper that rubs the string to give the growl, and air pushes the piston up and down to cause the pitch to change. might sound more like a big frog.
just odd thoughts.
on another note, ever run the edge of a pick down your guitar stings? a large wound bass string strung tight with something scraping down the edge at the right speed might give a growl.
now imagine a a 4 foot section of 4 inch pipe set up like a slide whistle with a piston type thing that runs up and down with a heavy bass string stung through the center. the piston has a spring loaded scraper that rubs the string to give the growl, and air pushes the piston up and down to cause the pitch to change. might sound more like a big frog.
just odd thoughts.