I understand that, but what about the difference between 4148s and 4001s? They both have a FVD of around 0.7V, right? Yet in my own experimentations with a boutique TS circuit I built, I found the 4001s to have a much more mellow sound.
The 4001s will have more junction capacitance, which might make a different if you have a 1Meg feedback resistor and no other capacitor there.
So this is my question to you: What the hell is up with capacitance, tone, and clipping characteristics? I've seen it used to describe the relative hardness/softness of the 'knee', but Merlin's findings have me very confused. They suggest that the 'knee' may me more of an aural phenomenon rather than a physical property of the diode. I also read some university PowerPoint slides on junction capacitance, and one thing that caught my eye was that the diodes still leak a bit of current through the cathode after they switch from on to off. In that split second of time between states then, would a diode with a 15pf junction capacitance more or less be acting as a discharging 15pf capacitor? I'm building a Rat for my EE100 final project, and I've got to explain this stuff beyond the oscilloscope. I asked this on the other forum, too, but the thread's gone cold .