voice synthesis with ml22q54

[globalsys]

Hello everybody!
I am trying to do voice synthesis using :
1) pic 18LF4520 from microchip
2) ml22q54 from oki

I have programmed the functions for controling the ml22q54 and we are sure, they are good.

I have programmed the phrases on my ml22q54 before.

In my main program I put in while(1) the play command but it only works (I mean, I heard the voice) when the ml22q54 is switched on and after it doesn't work. It works only at the switch commutation.

If somebody have found this problem or a similar problem before, please advise me.

Thanks.

Best regard