Bypassable Clean Blend

[nate433]

I have a friend who wants a Big Muff with a clean blend. This hitch is he wants the clean blend on a footswitch so that he can toggle it off mid song and get the full blown fuzz.

Would it be as simple as a adding a switch in the blend path like this to disconnect it (Obsidious for example):



Or would there be more to consider?
Would the best way be to add a buffer at the beginner and end like this the above schematic? I've only used the Buff N Blend daughterboards in the past when adding a blend, so this is all new to me but it feels possible.

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Alternatively he has a weirder idea:
1. There's a toggle that either combines the clean and fuzz signal into one output or splits them so that fuzz is in one and clean is in the other.
2. A footswitch that can turn off the clean, but when it does the fuzz is sent out to both outputs

Now this one I have no idea if that is even remotely possible but here are some drawings he gave



Thanks!

 

[jwin615]

Assuming you're talk about an opamp muff, it won't be that simple because the first and last gain stages are inverting. If you pull off the first opamp, you'll be out of phase mixing in after the 3rd gain stage. For all our fuzz settings, this won't be as big of an issue but if the point is to stack a kinda dirty but not all out fuzz muff into another drive, you'll definitely notice it.
Better off using an independent split and blend.

On a Pi, you could try branching off the collector of Q1 and blending back into the base of Q4. Not sure how good it will sound but it will be in phase

 

[nate433]

Assuming you're talk about an opamp muff, it won't be that simple because the first and last gain stages are inverting. If you pull off the first opamp, you'll be out of phase mixing in after the 3rd gain stage. For all our fuzz settings, this won't be as big of an issue but if the point is to stack a kinda dirty but not all out fuzz muff into another drive, you'll definitely notice it.
Better off using an independent split and blend.

On a Pi, you could try branching off the collector of Q1 and blending back into the base of Q4. Not sure how good it will sound but it will be in phase

It's a tone wicker BMP, so shouldn't have to worry about phase right?

 

[jwin615]

Yes. Every transistor gain stage inverts phase, at least in the muff(there are different types of transistor gain stages that are too much to cover here).
You can't go input to output for a multitude of reasons. Well, you can, but it won't be great and will result in weird loading issues.
But, you can go post Q1 and pre Q4 as indicated above. You can try it with some clips on the transistor legs, assuming it's through hole. That leaves 2 gain stages between your "switch" but since each inverts phase, the culmination is in phase.

Again. This isn't how I would go a out this, but it's the cheap and easy way.
I have to ask. What is the end result your friend is looking for? What's the ideal destination? 'cause there's a hundred ways to Detroit...

 

[JTEX]

Is there such thing as a "clean blend" pedal? Like, its sole purpose would be to add the option of a clean blend to some other pedal that lacks it? With a polarity reverse option, of course, to accommodate all situations?

 

[nate433]

Is there such thing as a "clean blend" pedal? Like, its sole purpose would be to add the option of a clean blend to some other pedal that lacks it? With a polarity reverse option, of course, to accommodate all situations?

The OBNE Signal Blender, kinda?