GetParameterFloat returning invalid status when attempting to use Voicemeeter API with AHK

Question

I am attempting to right a simple script in AutoHotKey (AHK) that I can use to switch sources a bit more easily that with the Voicemeeter Remote panel that is included. I am using Voicemeeter Potato. After some mucking around, I was able to get the SetParameterFloat API call to work. For some reason I cannot get the GetParameterFloat call to work when trying to retrieve the status of the input selection (A1, A2, etc). GetParameterFloat just returns 0 regardless of whether the input is enabled. Is there something I have missed here?

Here is my full code (most promising version to date)

#NoEnv  ; Recommended for performance and compatibility with future AutoHotkey releases.
; #Warn  ; Enable warnings to assist with detecting common errors.
SendMode Input  ; Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir%  ; Ensures a consistent starting directory.
#SingleInstance Force

 WinWait, ahk_exe voicemeeter8.exe  ; wait for voicemeeter

DllLoad := DllCall("LoadLibrary", "Str", "C:\Program Files (x86)\VB\Voicemeeter\VoicemeeterRemote64.dll")
MsgBox, LoadLibrary: %ErrorLevel%

VMLogin()
OnExit("VMLogout")

Result := DllCall("VoicemeeterRemote64\VBVMR_SetParameterFloat", "AStr", "Bus[0].Gain", "Float", 0.0)
Result := DllCall("VoicemeeterRemote64\VBVMR_SetParameterFloat", "AStr", "Bus[1].Gain", "Float", 0.0)
Result := DllCall("VoicemeeterRemote64\VBVMR_SetParameterFloat", "AStr", "Strip[3].A1", "Float", 1.0)
Result := DllCall("VoicemeeterRemote64\VBVMR_SetParameterFloat", "AStr", "Strip[3].A2", "Float", 0.0)


VMLogin() {
    Login := DllCall("VoicemeeterRemote64\VBVMR_Login")
    MsgBox,Login: %ErrorLevel%
}

VMLogout() {
    Logout := DllCall("VoicemeeterRemote64\VBVMR_Logout")
    MsgBox, Logout: %ErrorLevel%
}

!s::
    DllCall("VoicemeeterRemote64\VBVMR_IsParametersDirty")
    MsgBox, IsParameterDirty: %ErrorLevel%
    Result := DllCall("VoicemeeterRemote64\VBVMR_GetParameterFloat", "AStr", "Strip[1].A1", "Ptr", &str1stat, "Int")
    MsgBox, GetParameterFloat: %ErrorLevel%
    str1stat := NumGet(str1stat, 0, "Float")
    MsgBox, NumGet: %str1stat%
    MsgBox, GetResult: %Result%
    Result := DllCall("VoicemeeterRemote64\VBVMR_SetParameterFloat", "AStr", "Strip[1].A1", "Float", 1.0)
    MsgBox, SetParameterFloat: %ErrorLevel%
return

Majority of this code has been gleaned from here: https://gist.github.com/dcragusa/f3ab67ba1ed692cb628d1ef45dc9fac1

I am very new to using API calls so I would not be surprised if I missed something simple.