Got a request for more blend effects, so let's start with a simple one. You can use this as a daughter board to add a blend control to an existing pedal (or incorporate it into something else you're building), or use it as a stand alone blending pedal. 2N5457 should work just fine for both transistors.
This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.