增加/减少声音的方法

Question

有没有更好的方法来增加或减少主音？现在我用

Imports System.Runtime.InteropServices

Private Const APPCOMMAND_VOLUME_MUTE As Integer = &H80000
Private Const APPCOMMAND_VOLUME_UP As Integer = &HA0000
Private Const APPCOMMAND_VOLUME_DOWN As Integer = &H90000
Private Const WM_APPCOMMAND As Integer = &H319
<DllImport("user32.dll")> Public Shared Function SendMessageW(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr
End Function

并调用这些命令：

SendMessageW(Me.Handle, WM_APPCOMMAND, Me.Handle, New IntPtr(APPCOMMAND_VOLUME_UP))
SendMessageW(Me.Handle, WM_APPCOMMAND, Me.Handle, New IntPtr(APPCOMMAND_VOLUME_DOWN))
SendMessageW(Me.Handle, WM_APPCOMMAND, Me.Handle, New IntPtr(APPCOMMAND_VOLUME_MUTE))

这些只会将声音增加/减少2，但如果我想将其增加50或者将其设置为特定级别会怎么样？

我尝试多次调用该命令，但可能有更简洁的方法。