Hmmm well I played around a lot with this pedal and after a few weeks and lots of solder here's what I came up with ...
I started with the Keeley Ultra mod but found it way too muddy for my rig .... here's where I ended up. I tried to build a bit of low end in each stage.
All caps are Panasonic Film unless otherwise noted and resistors are 1% metal film.
Some of the caps I left the same value and just replaced them with metal film ( who knows how much difference but what the hell ...)
C1, C10, C11 ---- .047uf
C2 ----------------- .68uf
C3, C5 ------------ .068uF
C4 ----------------- 470pf Silver Mica
C7 ----------------- 220pf Silver Mica
C8, C14 ----------- 1uf
C9 ----------------- .47uf
C12, C13 --------- .1uf
D5 LED ( mounted on the front like the SEM )
R13 ---------------- 2K4
R39 ---------------- 20K
R16 ---------------- 4k7
Sound clip ... I quickly mic'd up my Boogie +22 ( 1X12 ) with an SM57
I played my strat with a humbucker in the bridge ...
Boogie set just to the point of breakup on the clean channel.
DS-1 settings: Tone at 3:00, Level at 1:00, Dist at 2:00 ...
Please ignore my sloppy one take wanking
http://users.eastlink.ca/~melanhead/MP3/DS1-demo.mp3a bit more gain than I usually use but fun anyways!
EDIT: There are more sound clips later in the post...
I love this place !