Prophet 5 Filter Envelope Attack Issue

[ManfredYildirim]

Hi!
I just bought a used Prophet 5 Rev4 (keyboard version) and I'm loving the hell out of it, but there's one thing that doesn't seem quite right:
The Filter Envelope Attack apparently only knows "zero time" and "many seconds", nothing in between.

So based on a fresh (and otherwise untouched) Basic Preset, I dial in:

Rev: 3 (or 1/2, doesn't matter)
Cutoff: 0
Resonance: 0
Env Amount: 10
Keyboard half/full: OFF

Filter Env
Attack: X, starting at 0
Decay: 0
Sustain: 10
Release: 0

Velocity: OFF
Aftertouch: OFF
Release/Hold: OFF

As I slowly turn up the Attack while repeating the same note, at first I hear a rather open fiter, obviously, but without any notable changes to the attack. Then, before I even reach 1 on the Attack knob, there's a sudden jump to a fully closed filter and the Attack time abruptly becomes something like 10 seconds. Above a value of roughly 1, it doesn't seem to make a difference whether I set it to 2 or 10, it's always the same 10 (or 15? in any case: many, too many) seconds, just as if the parameter was of binary nature: zero or max.

I made a little video of that: https://www.dropbox.com/s/kkfh012gol0jbbg/Prophet5_Attack.mp4?dl=0

Here's what I tried so far:
-initial settings/reset global parameters as per the troubleshooting instructions
-disconnect everything but power and audio out (MIDI/USB/Pedal etc)
-Tune
-power cycle, obviously
-Edit: Pot Mode

I also considered the scenario of me just being stupid, so I tried the same settings on a Prophet 5 virtual instrument (Arturia) and it's definitely different there - in the 4-6 attack range (50-170ms -ish, the UI says) there's that lovely quack-like filter movement I've been looking for.

Any ideas?
Thanks a lot, Manfred

edit: Prophet OS version is 2.0.1
edit 2: also, this (phone audio only): https://www.dropbox.com/s/xd0126oo2oubrwy/IMG_9779.mov?dl=0

[Manbird]

Hi!
I just bought a used Prophet 5 Rev4 (keyboard version) and I'm loving the hell out of it, but there's one thing that doesn't seem quite right:
The Filter Envelope Attack apparently only knows "zero time" and "many seconds", nothing in between.

So based on a fresh (and otherwise untouched) Basic Preset, I dial in:

Rev: 3 (or 1/2, doesn't matter)
Cutoff: 0
Resonance: 0
Env Amount: 10
Keyboard half/full: OFF

Filter Env
Attack: X, starting at 0
Decay: 0
Sustain: 10
Release: 0

Velocity: OFF
Aftertouch: OFF
Release/Hold: OFF

As I slowly turn up the Attack while repeating the same note, at first I hear a rather open fiter, obviously, but without any notable changes to the attack. Then, before I even reach 1 on the Attack knob, there's a sudden jump to a fully closed filter and the Attack time abruptly becomes something like 10 seconds. Above a value of roughly 1, it doesn't seem to make a difference whether I set it to 2 or 10, it's always the same 10 (or 15? in any case: many, too many) seconds, just as if the parameter was of binary nature: zero or max.

I made a little video of that: https://www.dropbox.com/s/kkfh012gol0jbbg/Prophet5_Attack.mp4?dl=0

Here's what I tried so far:
-initial settings/reset global parameters as per the troubleshooting instructions
-disconnect everything but power and audio out (MIDI/USB/Pedal etc)
-Tune
-power cycle, obviously

I also considered the scenario of me just being stupid, so I tried the same settings on a Prophet 5 virtual instrument (Arturia) and it's definitely different there - in the 4-6 attack range (50-170ms -ish, the UI says) there's that lovely quack-like filter movement I've been looking for.

Any ideas?
Thanks a lot, Manfred

edit: Prophet OS version is 2.0.1
edit 2: also, this (phone audio only): https://www.dropbox.com/s/xd0126oo2oubrwy/IMG_9779.mov?dl=0

Take a look at page 14 in the manual - it sounds like a question of Pot Mode settings. Should be a very simple adjustment...
https://davesmith.wpenginepowered.com/wp-content/uploads/2021/02/Prophet-5-Users-Guide-1.3.pdf

[ManfredYildirim]

Thanks for your reply!

Take a look at page 14 in the manual - it sounds like a question of Pot Mode settings. Should be a very simple adjustment...
https://davesmith.wpenginepowered.com/wp-content/uploads/2021/02/Prophet-5-Users-Guide-1.3.pdf

Tried that, too. All 3 modes, to no avail. 

[chysn]

Note also that the Rossum and Curtis filter setting affects whether the envelope behavior is linear or logarithmic. See if using the other filter makes a difference.

But the behavior you describe isn’t my experience. The relationship between knob and attack is what I’d expect, based on the selected filter.