Ramble FX Twin Bender question

[caspercody]

Hello

I know this is a Tone Bender circuit, but does anyone know what they are doing to create the impede control? Or what they did for the mids/stock/fat switch?

Thanks
Rob
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[karul]

https://www.ramblefx.com/twin-bender

THREE-WAY EQ SWITCH
The Tone Bender circuit doesn't adapt well to a tone knob. This switch swaps out capacitors in order to get three different voicings while preserving the stock circuit.

https://www.ramblefx.com/_files/ugd/cd9 ... 365a14.pdf

IMPEDE (MINI-KNOB).
This changes the impedance by adding resistance at the input. Fully clockwise is no resistance, the stock Tone Bender setting. Turn this counter-clockwise to help restore tone if Twin Bender is placed after a buffer, or to restore a wah's tone if placed after a wah. It also has a large effect on gain and tone

https://www.ramblefx.com/fuzz-tips

Some people use an external buffer with a bypass loop pedal to handle the switching. Some use a circuit called a pickup simulator. Sometimes it just takes some resistance between the pedals to restore the wah. With the current version Twin Bender, simply turn the 'IMPEDE' mini-knob to restore good tone.

[karul]

[caspercody]

Thanks, but looking for schematic’s showing how they might have done this.

[mauman]

Mid/Stock/Fat is probably switching the input cap to add low end. Center position is stock cap only, Mid adds another cap in parallel, Fat adds a larger cap in parallel. Impede pot is 100kB and sits at the input, maybe in series with the 100k from Q1 base to ground?

[karul]

"impede knob" (100k LIN, value mentioned in GBE video) - 50k knob in fulltone 69 ?

as mouman suggested, good candidate for tone switch is the input cap

[karul]

some gutshots, different layout
https://murakawavn.exblog.jp/21840750/