Here's a collection of vero (stripboard) and tagboard guitar and bass effect layouts that we have put together covering many classic and popular effects in growing numbers. Many of these have been posted on freestompboxes.org, so check that site out for great discussions on building your own effect pedals. Enjoy the builds and please also visit us on Facebook and Twitter
Electro Harmonix Black Finger Compressor/Sustainer
Here is a layout for the older version of EH Black Finger.
You can find the original FSB thread here.
I've used Pedalgrinder slightly modified schematic on page 3.
Some suggested high gain, some low gain transistors.
Should test them both.