Vintage Gibson W2 Maestro Woodwind Guitar Synth Effect

via this auction
"The sounds that come out of this thing are absolutely insane. Most unique effects box I have heard. The beauty is you can plug any thing in to the 1/8" input jack. ANYTHING Woodwinds (what it was designed for) Guitar, Keyboards, Bass, and even drumbeats and mixes. Just some adjusting of the sensitivity knob. It applies the early synth like filters with organ bar style controls. Best described as an octaver/fuzz/synth with tremolo. Any musician or engineer or DJ could benefit from the unique tones to set them apart. Super rare only manufactured in 1967."