Based on customer feedback, in June 2012 we introduced an updated Lex design that includes an internal jumper allowing for selectable TRS stereo input, as well as non-click footswitches.
This FAQ does not apply to Lex mono input (now discontinued), which was manufactured before May 2012 and includes a mono input. Read this FAQ to determine which pedal you have.
The input can be set for either mono input or TRS stereo input. The pedal ships in mono configuration from the factory.
In order to use the TRS stereo input, you’ll need a TRS stereo input adapter like the one shown below. You can purchase one here.