Trackbar fonctionnelle, besoin d'aide

Public Class Form1

    Private Sub Commencer_Click(sender As System.Object, e As System.EventArgs) Handles Commencer.Click
        Timer1.Start()
    End Sub

    Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
        Timer1.Stop()
    End Sub

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        TextBox1.Clear()
    End Sub

    Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
        On Error Resume Next
        SendKeys.Send(TextBox1.Text)
        On Error Resume Next
        SendKeys.Send("{Enter}")
    End Sub


    Private Sub TrackBar1_Scroll(sender As System.Object, e As System.EventArgs) Handles TrackBar1.Scroll
        Timer1.Interval := TrackBar1.Position;
    End Sub
End Class