Plug Me In is an Atlantic Records jazz LP from 1968. The album features Eddie Harris “& his electric saxophone,” though the tenor saxophone in question is still an acoustic instrument. As we can see in the cover photograph by Lee Friedlander, Harris is sending a signal from his acoustic instrument into a Maestro W-2 effects unit – a “Sound System for Woodwinds” as it was originally pitched. Most of the playing album doesn’t sound particularly effected, though the altered tone is clearly audible in “Theme in Search of a T.V. Commercial.”
The cover design is by Marvin Israel, who used Allen Riptide here in a two-color and multiple-size setting (the dashes around the Mistral setting are enlarged from the other Riptide letters).
If you’re curious about the W-2, here’s a demo of it in use, and here’s a demonstration record of the W-2’s successor, the W-3.