Lowpass filter not opening all the way when triggered by envelope

My envelope is sent to filter cutoff CV and my oscillator is going through the filter.

Both are being triggered by the same gate source.

The envelope is adsr and the attack is at zero.

There's nothing like a CV amount or attenuator or envelope amount knob on either the filter or eg.

I've tried triggering the eg with several different gate sources.

When I start to close the filter I can hear the envelope working but the more I close it the higher frequencies are lost from the transients. As if it's not opening all the way or it's not opening fast enough. I want to use this to sculpt kicks, so keeping the snap is important. I want my filter to start fully open and move to the cutoff position from there.

Is this an envelope problem or a filter problem?

Are not all filters built to handle envelopes?

What other questions should I be asking?

Interesting problem. For me to be able to make an educated guess, it'd be great if you could list the exact modules at work here. Every filter, every envelope is unique in its design and might respond differently to the same input. Here are some questions for clarification and guesses from me:

Both are being triggered by the same gate source.

By both, you mean the envelope and what else? Are you applying the gate signal to the filter in addition to the envelope? Or are you syncing/resetting the oscillator with the gate signal?

The envelope is adsr and the attack is at zero.

What exact model is the envelope module? Attack at zero does not necessarily mean an "attack time" of 0 seconds. Usually, the attack stage takes at least a few ms to reach full amplitude. This might be an issue.

There's nothing like a CV amount or attenuator or envelope amount knob on either the filter or eg.

Next potential problem: The envelope output amplitude might be too low from the start. If it's only putting out up to +5V, that might still not be enough to open up the filter as much as you'd like it. Check the manual, it ought to list the envelope output amplitude under the specs.

EDITED Today, 06:18

![]its the morphor dual adsr.The filter is Gem LP by Gods Box. And I just mean the adsr and the swarms oscillator are both being triggered at the same time, and the adsr then affects the filter. So about attack time, maybe I need to get an eg that has the quickest attack time possible if I want to be using it for drums. But then how do I know which are good for that, assuming this is the issue?
(https://storage.googleapis.com/modulargrid.net/easymde/222638_3653a3dec2750d9985e3d4478923242d_1756117907.jpg)

From the Morphor Dual Envelope's manual, I'm seeing that

1.) There is a length switch on the back of the module to set the overall length of the envelope. Set it to short to get the snappiest possible response.
2.) The output amplitude is 0-5V. This might indeed not be enough to fully open a filter. Do you have a module that can amplify voltage beyond unity gain? Even though some modules are called amplifiers or VCAs, they might not necessarily be able to increase incoming voltage beyond a factor of 1. If you have one, patch the envelope through it and increase the amplitude to try to get a higher voltage swing.

For the Gem LP, there doesn't seem to be a manual available on the web, so I can't say for certain that this is the root cause. You will have to do some additional testing.