3 or 4 knobs version of BSIAB 2?

[Picassochild]

Hey guys...just have found review of GGG BSIAB 2 at HC Effects Reviews...and newest one is about some latest version of BSIAB 2 which has 4 knobs: Gain, Level, Tone and Contour. Where can I find scheme of this version? And what the differense? Thanks.

[d95err]

A wild guess is that someone put something like the AMZ Tone Control (http://www.muzique.com/lab/tone3.htm) in it instead of the original Big Muff style tone control.

[Picassochild]

bump guys

[petemoore]

bump guys

Knobs...
  Pregain
  Voltage drop [doubtful but cool at the same time]
  Basically there's a bunch of places another knob can be used on any type build, I'd say another tone control knob is as good a choice as any, especially if you want more tone control.

[Picassochild]

where can I find scheme of this version?

[powerplayj]

Big Ole' Bump

I've got this thing in a big enclosure as it is so, one more knob won't hurt.  Again, where in the circuit can the "contour" control be implemented?  Anyone?  JD? Ed?

Thanks,

Jason

[stm]

The schematic of the 4-knob BSIAB is just here, on top of the page:

http://gtlab.net/gtlab2/readarticle.php?article_id=33

...and its successor follows half a page down: BSIAB Extrem

Would love to hear how they compare side by sade with the original BSIAB II.

[stm]

If you are willing to grasp the theory behind those changes, you can read here:

http://www.rusblues.ru/articles/tech/tech04.shtml

It is in russian, so now go to the end of the first page of this thread and you'll find some PDFs with automoron translations:

http://www.elixant.com/~stompbox/smfforum/index.php?topic=27925.0

[Doug_H]

Looks like the 4th knob is a mid control on the BMP tone circuit. I think Jack Orman proposed this years ago and it is on his site somewhere.

Doug

[Bucksears]

Is it possible to add a 25k pot as a mid control in (relatively) the same place using the stock BSIAB II's tone control?
i.e. does the mid control add-on only work on a BMP tone control config?

Thanks,
- Buck