Use:
play %s
not
spk %s
If that does still not work, try removing the ".wav".
If there is still no sound there is a Problem with the .wav it self.
0.85 or above is probably showing the Message out of screen. (under Bottom)
Use values between 0.01 and 0.8 for Y.
For X use small Values or -1.
(Note: 0.5 != -1, -1 will Center the Message on that axis,
0.5 will make Message start at the Center of that axis.)
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