Unbuffered Diodes Before Tonestack

[YourGuitarist]

Hello,

I've been working on a design where I'd like to use a pair of hard clipping antiparallel diodes to ground to form a "clamp" circuit (limit peak voltage swings). Given the limitation I've placed on myself to not use excessive buffers/active stages, I'm trying squeeze them in with a another stage, namely a tonestack. The TS requires low input impedance, which I suspect might be an issue if the preceding diodes ARE NOT conducting. I'm wondering if other people have experience working with diodes in this manner and have advice/suggestions? I don't have access to breadboard right now but would otherwise test there too.

Here's an example circuit of the phenomena.

 

[YourGuitarist]

Gonna answer my own question just for reference here.

After some thought, I realized that resistor R14 in the example also forms a path to ground through the output of the opamp prior. The current limiting resistor R14 is a virtual requirement for any hard clipping diodes. When looking back from the tonestack, resistor R14 is in series with the output resistance of the opamp which is all in parallel with the clipping diodes. Even if neither diode conducts and has "infinite" resistance, the low resistance path created through the output impedance of the opamp shunts the diodes and keeps the source impedance as seen by the tonestack low regardless of clipping.