Updating Post Processing Volume in Real Time (2019.3)

Hi everyone, I'm trying to set up a script so that as my player's health gets lower, the chromatic aberration effect increases. Right now, I have a Volume set up so that its effects can be seen in the scene and game views, but I can't access it through a script. Declaring a public PostProcessVolume won't take my Volume as an argument, but when I switch from a Volume to a Post-Process Volume its effects can't be seen in the scene or game views.

This is my PostProcessing setup:




This is my script I've been working with:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.Rendering.PostProcessing;
5.  
6. public class aberrationController : MonoBehaviour
7. {
8.     public PostProcessVolume volume;
9.     // Start is called before the first frame update
10.     void Start()
11.     {
12.         ChromaticAberration ca;
13.         volume.profile.TryGetSettings(out ca);
14.         ca.intensity = new FloatParameter { value = 1 };
15.  
16.     }
17.  
18.     // Update is called once per frame
19.     void Update()
20.     {
21.         ChromaticAberration ca;
22.         volume.profile.TryGetSettings(out ca);
23.         ca.intensity.value = 1f;
24.  
25.     }
26. }
27.