Acrobat Parametric Distortion

[comradehoser]

I’m not questioning the B10K itself. I’m trying to verify that both gangs of the Height control are represented correctly, including their connections, orientation and interaction with the surrounding filter network.

I think if you follow the schematic correctly, then this will also follow. I don’t have any experience with spice but my understanding is that this is how that works.

The digital model is based on the Acrobat schematic and a SPICE reconstruction. It already reproduces the expected cut/boost behaviour, but I’m investigating the rather large output-level variations across Height, Frequency and Bandwidth.

My circuit is very much this and so is everyone else’s apparently, thus the volume mod. It’s inherent to the circuit design. Not sure what an auto level would add to a master volume. That seems like an overly complex solution. I would think most guitarists would have one maybe two combos that they would use and would just dial in volume to taste.

Regarding the rotary switch, I agree that the PCB should follow the schematic. I was simply hoping to independently verify the exact resistor-to-position assignments, since some of the traces are hidden beneath the assembled board

I can pretty much guarantee that the exact resistor to position assignment is the same as the schematic

 

[oneyedpet]

I think if you follow the schematic correctly, then this will also follow. I don’t have any experience with spice but my understanding is that this is how that works.

My circuit is very much this and so is everyone else’s apparently, thus the volume mod. It’s inherent to the circuit design. Not sure what an auto level would add to a master volume. That seems like an overly complex solution. I would think most guitarists would have one maybe two combos that they would use and would just dial in volume to taste.

I can pretty much guarantee that the exact resistor to position assignment is the same as the schematic

Thanks again, that clears up a lot!


I completely agree that the natural volume variations should be preserved in the digital model. The optional auto-level would simply be a separate convenience feature.


Just one last question based on your experience with the actual pedal:


When turning Height from minimum to maximum in Dirty mode, does the overall output level generally increase towards the middle of the rotation and then decrease towards the maximum?


Or is the behaviour more dependent on the Frequency and Bandwidth settings?


I’m not looking for measurements, just your subjective experience with the pedal.


Thanks again for your help!