The Official Sequential/DSI Forum

Filter EG not opening filter all the way

Filter EG not opening filter all the way
« on: October 18, 2021, 09:05:50 AM »
Hi! I own a Prophet 5 rev 3 and just purchased a Prophet 10 rev 4. I have noticed a significant difference in the filter EG and was curious if this was a known issue. When cutoff is zero, keyboard control is full, and filter EG is 100% the rev 4 only opens 70% as much as the rev 3. I am saying 70% because I am matching the self-oscillating resonance note on both and have to back the rev 3 EG to 70% to match out the max'ed out rev 4 EG. This seems rather significant and does limit the kind of patches one can program.
« Last Edit: October 18, 2021, 10:35:03 AM by pppalladino »

Re: Filter EG not opening filter all the way
« Reply #1 on: October 18, 2021, 01:24:50 PM »
My filter EG also doesn't open as much as I would have expected but I wondered if it's just how the Prophet 5 behaves.  Interesting that you find such a noticeable difference with the rev 3.  I would certainly prefer the EG to open more fully as many patches sound extremely dull when cutoff is at zero.


LPF83

  • ***
  • 707
Re: Filter EG not opening filter all the way
« Reply #2 on: October 18, 2021, 03:54:59 PM »
Do you have a low serial number unit by any chance?

https://forum.sequential.com/index.php/topic,4747.0.html
Prophet 10, Prophet 6, OB-6, Prophet 12m, Prophet Rev2-16, Toraiz AS-1, Moog SlimPhatty, Hydrasynth desktop, Korg Minilogue XDm, Roland SPD-30, Roland SPD-SX Special Edition, Roland KT-10, Maschine, Focusrite Scarlett 18i20 3rd Gen + Octopre, Strymon Pedals, Cubase Pro 11.

Re: Filter EG not opening filter all the way
« Reply #3 on: October 18, 2021, 03:57:08 PM »
Yeah, it's in the quadruple digits. So, well after that early cap issue
« Last Edit: October 18, 2021, 03:58:56 PM by pppalladino »

Re: Filter EG not opening filter all the way
« Reply #4 on: October 18, 2021, 04:02:28 PM »
The difference between the rev3 and rev4 is significant. I would doubt that it is just the age difference. I can get the rev 4 filter EG to match the rev3 by applying poly mod from the filter to the filter. So, having the filter eg modulate/multiply itself. Even then I have to set the poly-mod amount to 25%. Maybe that is a fine work around.

I did contact customer service and they said this was to be expected. The rev 3, with filter in self-oscillation, will go above hearing range when the filter eg reaches the top. I can't do that with the rev 4...perhaps I just happen to have a rev3 with a hot filter eg??
« Last Edit: October 18, 2021, 04:05:52 PM by pppalladino »

LPF83

  • ***
  • 707
Re: Filter EG not opening filter all the way
« Reply #5 on: October 18, 2021, 04:15:18 PM »
Is the difference you're finding greater than in this vid?

https://www.youtube.com/watch?v=6tsV0eVijYY
Prophet 10, Prophet 6, OB-6, Prophet 12m, Prophet Rev2-16, Toraiz AS-1, Moog SlimPhatty, Hydrasynth desktop, Korg Minilogue XDm, Roland SPD-30, Roland SPD-SX Special Edition, Roland KT-10, Maschine, Focusrite Scarlett 18i20 3rd Gen + Octopre, Strymon Pedals, Cubase Pro 11.

Re: Filter EG not opening filter all the way
« Reply #6 on: October 18, 2021, 04:54:14 PM »
Yeah it's more drastic than that. I am going to make a video and share w/ support.