The MU1500 Funky-Filter made input signals sound like synths. The pedal was
an "envelope follower" or auto-wah. The schematic was exactly the
same as a MuTron III, they were actualyl licensed from MuTron. Same as Univox
Availibly after 1976, design was similar to MXR pedals. Also, foot switch was
a big cartoon foot.
Copyright Michael Wright, author of Guitar Stories Vol. 2, and Vintage
Guitar Magazine; used by permission.