Android Question SoundPool - Problem not playing short sound

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Dim phoneVib As PhoneVibrate
    Dim phone As Phone
    Dim NMTimer As Timer
    Dim sp As SoundPool
    
    .....
    
    
Sub Activity_Create(FirstTime As Boolean)
    'initialise the pong mp3 sound
    sp.Initialize(3)
    
    ......
    
Sub playBeepSound
    Dim LoadId As Int = sp.Load(File.DirAssets, "Pong.mp3")

    Log("Play Beep Sound. LoadID is " & LoadId)
    'LoadID L_Vol(0-1)   R_Vol(0-1)   Priority   Loop(Repeat Cycles)   Rate(0-2)
    
    If sp.Play(LoadId,1,1,1,0,1) = 0 Then
        Log("Error")
    Else
        sp.Play(LoadId,1,1,1,0,1)
    End If
End Sub