MBS Audio stopping

Okay…found some time to test the MBS Audio plugin…
And with a little tweaking I get the sweep sine wave with the Port Audio example app.

The Callback looks like this now to generate the sweep:

Var n,c,i As Integer
Var f As Single
Var increment As Single = frequency / 7639.437

PlayWindow.FrequencyLabel.Text = Str(frequency) + " Hz"

c=FrameCount-1
for i=0 to c
  sinIndex = sinIndex + increment
  if sinIndex>2*3.1415926 then sinIndex=sinIndex-2*3.1415926
  f = sin(sinIndex) / 2
  
  outputBuffer.SingleValue(n)=f // left
  n=n+4
  outputBuffer.SingleValue(n)=f // right
  n=n+4
next

If frequency <= 20000 then frequency = frequency + 20

Tried to stop the audio with a simple PlayWindow.Close as there is this Close event:

dim e as integer
if s<>nil then
  e=s.Stop
  e=s.Close
end if

But of course the app just hangs…
What is the correct way to stop the audio?

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