That current is what makes clipping possible because the moment the audio signal reaches Vf, signal voltage starts to be limited. I feel the OD-3 more dynamic, with more bass response, while the Tim Pierce is more focused on mids and covers a wider distortion range. Ge diodes are used in some mods also because of the smooth I-V curve the exhibit. Also found a very useful tools for analyzing frequency responses by generating signals and capturing the output of the pedal with a computer and its sound card, more on this in some future post. The entry-level set conforms to the popular concept of simple fast lossless installation high cost-effective modification.
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