Here is a vintage 1976 Univox MU-1500 Funky-Filter electric guitar effects pedal. Although this pedal says Univox on it, inside, this pedal has the exact same schematic and electronics as it’s more popular counterpart, the Mu-Tron III. The Mu-Tron II was perhaps the most famous of the excellent Musitronics product line, and was an instant success when originally introduced in the 1970s, and has remained popular ever since. The Univox Funky-Filter is an incredible sounding envelope filter/follower effect which has become an integral component of all bass players’ pedal boards, in addition to, a great effect for guitar, keyboard and synth. This example is in extremely excellent condition and includes a non-original box.