Version 1.4 has the buffer mod built into the board; for version 1.2, the buffer mod is optional. There is no other difference between the boards.

Download PDF

Download PDF


  1. Marty says:

    I have the v4 board and I want to use toggle switches instead of the foot switch but there’s no schematics for me to figure out how to wire them up.
    Can anyone help me out with this?

  2. Synthrotek says:

    You could use a 3PDT toggle instead, it would be a drop-in replacement.

  3. Marty says:

    The 3pdt toggle switch that I have has 12 pins and the board has only 9 pins. I looked all over the web to find this one, for another project, and it was the only one that I can remember finding. Isn’t there a way to use spst switches? Or even spdt ones.

  4. Synthrotek says:

    You could use one of those, but you wouldn’t get a bypass signal. We carry a 3PDT toggle on our site here:

Leave a Reply

Your email address will not be published. Required fields are marked *