Peak Controller Attack/Decay isn't a smooth curve

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### System Information

EndeavourOS

### LMMS Version(s)

12632e6b

### Most Recent Working Version

_No response_

### Bug Summary

This is the issue encountered in #1281 and #2534, I'm avoiding necroing them. As Unfa stated, the Atk/Dcy knobs seem to act more like buttons. Turning them both to 100% removes the clicking, at the cost of damping the audio being controlled. It's more noticable when the audio being used to control the controller is chaotic.
A reproducible project is attached.

### Expected Behaviour

The knobs should have an effect at all values.

### Steps To Reproduce

1. Load in two audio tracks; one to control the peak controller, and one to be controlled
2. put the peak controller on the furst track
3. bind the peak controller to the second tracks volume

### Logs

_No response_

### Screenshots / Minimum Reproducible Project

[broken-peak-controller.zip](https://github.com/user-attachments/files/16257367/broken-peak-controller.zip)

### Please search the issue tracker for existing bug reports before submitting your own.

- [X] I have searched all existing issues and confirmed that this is not a duplicate.

Start by opening the attached broken-peak-controller.zip project and reproducing the Peak Controller behavior using the listed two-track setup. Investigate the Peak Controller entry point and verify that the Atk/Dcy knobs have an effect across their full range without introducing clicking or unwanted damping.

Written by the indexing model from the issue text.