In pretty decent shape given its age, it works great.
The Schaller Bow-Wow Yoy-Yoy is a rare vintage effect pedal produced in the 1970s by Schaller, a German manufacturer known for their high-quality musical equipment. The pedal is designed to create a combination of wah-wah and yoy-yoy effects, producing a distinctive vowel-like modulation similar to a talkbox or envelope filter. This unique sound made the Bow-Wow Yoy-Yoy stand out as a quirky yet highly expressive effect for guitarists and bassists.
The Bow-Wow section operates much like a traditional wah pedal, providing a sweepable filter that accentuates certain frequencies, creating that classic “wah” effect. The Yoy-Yoy section is more unusual and delivers a different kind of modulation, producing a formant-like sound that mimics vocalizations, adding a dynamic and expressive quality to the player’s tone.
Due to its rarity and distinct sound, the Schaller Bow-Wow Yoy-Yoy has become a collectible piece of vintage gear, sought after by both musicians and collectors who are interested in unique and obscure effects. Although it’s no longer in production, it remains a fascinating example of 1970s effects technology.