Blend Circuit with Filtering

[Bambalam]

Hello! Thank you for checking out my post.

I am trying to use this "Simplified Gladio" blend circuit that is in the Why your Blends Suck Article to mix in some acoustic qualities to the incoming signal. Looking for a 100% - 50% - 100% blend. https://forum.pedalpcb.com/threads/why-your-clean-blends-suck-or-how-to-clean-blend.20986/



There should be another half of an opamp used, but I'm considering using a Fet instead because I have other plans for the other half of the opamp. Any recommendations?

 

[jesuscrisp]

Would you mind explaining what that filter is and does and how you want to include it in the simplified Gladio? Do you want to have it on your clean path, do you want to add it behind the clean path etc.

 

[Bambalam]

The idea is for the signal to reach the Blend Section and then get mixed with the "Acoustic Filter Section". I'm still sorting out the filter section, but I'm looking to add the effect of an acoustic guitar being played along with an electric guitar (woody, resonance, jangle, etc).


The "Acoustic Filter Section" is incomplete because I'm not sure where to connect a good signal source. Maybe the output of C8 or the output of the input section.

 

[jesuscrisp]

Not trying to be mean, but you won't get an acoustic emulation of any sort with that circuit.

 

[Feral Feline]

I'll suggest looking into WOODY ACOUSTIC SIM by Mark Hammer, both schematic & layout.

There's a vero layout over on Sabrotone.

The "Woody": a cheap acoustic simulator​

DIYstompboxes.com
https://www.diystompboxes.com › smfforum


Aug 23, 2003 — A fender-style guitar can sound quite like an acoustic one when playing rhytm with a live band trough a goodish amp.
Something more... a Woody?
Apr 2, 2016
Woody Acoustic SIm
May 12, 2004
Wich Acoustic Simulator project? - Page 4
Jul 11, 2009
Something more... a Woody? - Page 2

 

[Bambalam]

I'll suggest looking into WOODY ACOUSTIC SIM by Mark Hammer, both schematic & layout.

That's the circuit I have been playing around with and modifying for the acoustic section on a separate breadboard. The current filter is a place holder while I figure out how to get the blend working.

In the "Simplified Gladio" blend example, the clean signal into the CLEAN pot (BLEND in my circuit) taps into the IC in the input section.
In my circuit, I'm looking to take the signal out of the BOOST section, SIGNAL A, and blend it with a filtered Signal B (the acoustic sim).

I'm curious about the options for the Signal A source. Can I also connect Signal A to the output of the Boost section? Is there a different approach I should be looking at for this?

 

[Feral Feline]

I'm by no means authoritative on this topic...


I'm not quite able to wrap my brain around this, partly due to there being no "blending" going on.

"Blending" to me is taking two separate signals and mixing-mooshing-mushing-mashing them together — like a well-muddled coctail, the sum of the parts give a completely new flavour from the individual constituents.

Of course there are different ways of implementing a blend, which have been discussed elsewhere in the forum as noted in the OP.

In the post#3-schematic, I only see one signal path.

The "blend" is just administering how much signal gets through to the next stage, which has been split into two (blend & acoustic) but IMO aren't separate at all and still one section unto itself. That one section would affect the solitary audio-signal passing through the circuit.



The two options as I see it are:

1) Apply the EQ to the signal to make it sound "acoustic", how much EQ you apply will determine how "acoustic" the signal sounds.​

This is how the post#3-schematic appears to me.​

​

2) Split the signal, a true split, with one path being unaffected (Clean) and the other path run through the "Acoustic" EQ, and the two separate paths blended or summed back together into a sole mono signal before output.​

Is the OP's "1705531397548.png" (the schematic with yellow op-amps) the "Simplified Gladio"? At any rate, it has a clean blend going on, after having split the signal into two.

Comparing that 1705531397548.png to post#3's schematic ... well, I'm lost again, 'cause the two schematic snippets in post #6 eacj clearly identify two separate audio paths being mixed back to mono.




Further thought makes me think it would be good to have the Clean-electric sent to a separate FX loop, in 3 blocks (split, process, mix) something like this:

ELECTRIC-GUITAR > SPLIT A&B before ANY other processing​

​

A> "CLEAN-ELECTRIC" > distortion &/or other effects​

B> "CLEAN-ACOUSTIC" > Woodification ie EQ of woody resonance jangle​

​

A+B MIXED > OUTPUT​

That way you can make the electric sound even more electric, throw some warbly chorus and envelope-controlled tight delay on it so it's slightly out of time and tune with the "acoustic" signal to make it sound even more like a doubled guitar part.

No sense in trying to send a fuzzed out electric-guitar signal into the Woodification-Acoustifier, then everything gets burnt.

 

[Bambalam]

In the post#3-schematic, I only see one signal path.

2) Split the signal, a true split, with one path being unaffected (Clean) and the other path run through the "Acoustic" EQ, and the two separate paths blended or summed back together into a sole mono signal before output.​

Thanks for the reply. Sorry for any confusion, I have now edited the previous posts to clarify what I was trying to show.
Post 3 is where I'm currently at with the schematic.
Post 6 is a couple ideas I've had to try and find a solution.
Maybe I'm trying for more of a paner: 100% Electric - 50% both - 100% Acoustic

I think this would be more in line with the "Simplified Gladio" circuit. It would also avoid sending the boost into both Signal A and B.