Here's a collection of vero and tagboard guitar and bass effect layouts that we have put together covering all of the classic and popular effects in ever growing numbers. Many of these have been posted on two excellent forums, freestompboxes.org and circuitworkshop.com. Check those out for other great designs, layouts and discussions on building your own effect pedals. Enjoy the builds and please visit us at www.facebook.com/tagboardeffects!
I had a request for a vero of the Mastotron, so here's the Woolly Mammoth which is virtually the same, with the Mastotron just having an additional 100K linear pot which the input is taken to before the first capacitor.
The new input wiring with the Relax/Pull pot can be seen on my tagboard layout here: