vuol dire che l'applicazione non è bloccata, ma bensì al passaggio del mouse i controlli li posso selezionare, invece  con 
	codice:
	Public Class Form1
    Dim dlg As New OpenFileDialog
    Dim Synt As New SpeechSynthesizer
 
	codice:
	    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If RadioButton1.Checked Then
            Synt.SelectVoice("Paola")
        Else
            Synt.SelectVoice("Roberto")
            Synt.SelectVoice("ScanSoft Silvia_Dri40_16kHz")
        End If
        If RadioButton3.Checked Then Synt.SelectVoice("ScanSoft Silvia_Dri40_16kHz")
        Application.DoEvents()
        Synt.SpeakAsync(RichTextBox1.Text)
    End Sub
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Synt.SpeakAsyncCancelAll()
    End Sub
End Class
 
non si ferma il parlato