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Lexicon PCM70: Pan & Circular Delays

guitarnerdswe

Fractal Fanatic
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.

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 the 3 units that I have good enough clips of to measure this, 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 0.05 dB accuracy across both presets.
  • The diffusion in the Axe-Fx sounds quite different to the Lexicon. I've confirmed that the diffusion parameter in the PCM70 is not a mix control, but a time control. I measured the length of the diffusion on PCM70s Circular Delays preset, and then matched the length in the Axe-Fx. The diffusion in the PCM70 causes the actual delay times to drift. I figured out a neat way to capture this.
The presets have been converted to multitap delay blocks. Put them in your "Documents\Fractal Audio\Axe-Edit III\blocks" folder. They are meant to be used in parallel to the dry signal patch.

 

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RevDrucifer

Power User
Awesome, man! Thanks!

Edit-

I added them to my blocks folder, re-started AxeEdit and they aren't showing up. I've tried every variation of adding them in; creating new folders for them to put in the Blocks folder, putting them inside the Delay folder, etc....but they won't show up as an option in AxeEdit after. I'm feeling a bit dim right now!

Edit II- I found them in the Recall section of the Library!
 
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guitarnerdswe

Fractal Fanatic
yeah i know but they are not working for me,can you share a screenshot of your preset?also they are delays,multidelays
Again, they are blocks, not presets. If you look at the file extension, you will see that they're not sysex, but blk-files.

Try this:
  1. Download them.
  2. Put them in your "Documents\Fractal Audio\Axe-Edit III\blocks" folder.
  3. Open Axe-Edit.
  4. Put 2 multitap delay blocks your preset. Preferable in parallel to the dry signal.
  5. Select the first one.
  6. Down to the left, there is a window called "Block Library". Click it. A list pops up, select "Pan Delays".
  7. Repeat the process for the second multitap delay block, but select "Circular Delays" instead.
 

NightWalker

Power User
Again, they are blocks, not presets. If you look at the file extension, you will see that they're not sysex, but blk-files.

Try this:
  1. Download them.
  2. Put them in your "Documents\Fractal Audio\Axe-Edit III\blocks" folder.
  3. Open Axe-Edit.
  4. Put 2 multitap delay blocks your preset. Preferable in parallel to the dry signal.
  5. Select the first one.
  6. Down to the left, there is a window called "Block Library". Click it. A list pops up, select "Pan Delays".
  7. Repeat the process for the second multitap delay block, but select "Circular Delays" instead.
got it man,thank you.
 

levipeto

Fractal Fanatic
I hope it's ok to add, that if you copy them into
Again, they are blocks, not presets. If you look at the file extension, you will see that they're not sysex, but blk-files.

Try this:
  1. Download them.
  2. Put them in your "Documents\Fractal Audio\Axe-Edit III\blocks" folder.
  3. Open Axe-Edit.
  4. Put 2 multitap delay blocks your preset. Preferable in parallel to the dry signal.
  5. Select the first one.
  6. Down to the left, there is a window called "Block Library". Click it. A list pops up, select "Pan Delays".
  7. Repeat the process for the second multitap delay block, but select "Circular Delays" instead.

Do you mean copy them to "Documents\Fractal Audio\Axe-Edit III\blocks\Multi Delay\", right?
 

guitarnerdswe

Fractal Fanatic
I hope it's ok to add, that if you copy them into


Do you mean copy them to "Documents\Fractal Audio\Axe-Edit III\blocks\Multi Delay\", right?
It doesn't matter where you put them under the blocks folder, Axe-Edit scans the entire folder and it's sub folders. If someone hasn't saved a multitap delay to their block library, they won't have a "Multi Delay" folder to put the blk-files into, which can cause confusion (when in reality, it doesn't matter).
 

craiguitar

Power User
Thanks so much for updating these blocks.
I a/b‘d them with the previous versions I had in my presets and although the difference was subtle, theres a liveliness to these settings that wasn’t there before.
Again, it’s debatable as to whether authenticity in terms of precise settings is really the key to it, or to just Ignore that Stuff and hone in on the overall feel/vibe. Nevertheless, a really good job, and I think these sound really nice and that’s what counts.
 

guitarnerdswe

Fractal Fanatic
Thanks so much for updating these blocks.
I a/b‘d them with the previous versions I had in my presets and although the difference was subtle, theres a liveliness to these settings that wasn’t there before.
Again, it’s debatable as to whether authenticity in terms of precise settings is really the key to it, or to just Ignore that Stuff and hone in on the overall feel/vibe. Nevertheless, a really good job, and I think these sound really nice and that’s what counts.
I actually tried to create different "ideal" versions of these, and none of them sounded as good as the original wonky offset between the channels. It was most apparent in mono. The Pan Delays sounded monotone in mono when both voices where at equal volume. With the offset, there is more of a rhythmic quality to it, where one voice is floating beneath the other one.
 
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