I've been on a bit of a muff quest the past few months with bass and have finally figured a few things out. I recently socketed a lot of components and built an "ultimate" muff that works pretty well as a dirty boost, slight overdrive, and fuzz. I call it the Gold Muff. I realized, thought, that I want a dedicated "fuzz" muff on my board. For that purpose, I liked the sound of LEDs in the clipping diode sections on my Gold Muff and thought that perhaps an Ungula would fit that bill. I don't have a lot of time right now, so I just bought one off of Reverb. It "kinda" did the trick, but I felt like it wasn't letting enough low end through and as a result wasn't thick enough. Also, the clipping was more on the top end and not as full frequency as I think bass needs. So, I applied some of the component values that achieved this on my Gold Muff.
For those who want to build a more bass friendly version of the Ungula, here's what worked for me: it basically involves replacing the 100n coupling caps with 220n caps and the 100n clipping caps with 47n caps.
Switch out C3, C4, C7, C12, and C13 with 220n and C5 and C8 with 47n.
For those who want to build a more bass friendly version of the Ungula, here's what worked for me: it basically involves replacing the 100n coupling caps with 220n caps and the 100n clipping caps with 47n caps.
Switch out C3, C4, C7, C12, and C13 with 220n and C5 and C8 with 47n.