guitarnerdswe
Fractal Fanatic
EDIT 2022-09-11: These are now considered final versions, and are as accurate as I can possible make them. They supersede the factory types in the Axe-Fx, which were kind of a work in progress when they where added.
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First and foremost, a huge thanks to MrB, who has sent me a plethora of clips, and also has taken the time to measure his PCM70 with a pulse generator. He supplied me with more high quality clips and numbers than I could ever dream of. Shout out to Michael Nielsen and @2112 too.
Ok, here are the details:
Bonus: TC1210 for the multitap delay block, use in series.
-----------------------------------
First and foremost, a huge thanks to MrB, who has sent me a plethora of clips, and also has taken the time to measure his PCM70 with a pulse generator. He supplied me with more high quality clips and numbers than I could ever dream of. Shout out to Michael Nielsen and @2112 too.
Ok, here are the details:
- The PCM70 is quite a wonky unit. There is a big difference between the left/right outputs, and it changes with preset configurations and panning of the voices. The outputs have a +-1.5 dB margin of error according to the service manual (which is a lot). From measuring 4 units, it's always the right channel that is lower in volume. Listening carefully to soundboard recordings of Lukather, his units appear to have this "issue" as well. I suspect it's partly due to tolerances, and also the summing circuit at outputs that enable mono operation from one jack. Anyway, I've matched this behaviour to 0.01 dB accuracy across both presets.
- The diffusion in the Axe-Fx sounds quite different to the Lexicon. The diffusion parameter in the PCM70 is not a mix control, but a time control. The diffusion in the PCM70 causes the actual delay times to drift. I figured out a neat way to capture this.
Bonus: TC1210 for the multitap delay block, use in series.
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