Определить уровень громкости в системе

Imports System.Runtime.InteropServices
 
Public Class Form1
 
    <DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr
    End Function
 
    Const WM_APPCOMMAND As UInteger = &H319
    Const APPCOMMAND_VOLUME_UP As UInteger = &HA
    Const APPCOMMAND_VOLUME_DOWN As UInteger = &H9
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click ' Громкость +
        SendMessage(Me.Handle, WM_APPCOMMAND, &H30292, APPCOMMAND_VOLUME_UP * &H10000)
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click ' Громкость -
        SendMessage(Me.Handle, WM_APPCOMMAND, &H30292, APPCOMMAND_VOLUME_DOWN * &H10000)
    End Sub
End Class