Here's another quicky for your weekend. This is based on Tim Escobedo's LoFoMoFo, but tweaked for more bass frequencies. This circuit was actually my first build and it sounds great. Although, I made the n00b mistake of using a 10n cap on the input instead of the 100n because I misread the capacitor code. So I guess I should say it sounds good with a 10n input cap. Can't really speak to the stock sound, but it's apparently very fat. Should fit easily in a 1590a.
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.