I would like to share my experience with disappearing voice, using iGO Primo Israel 18.104.22.1683387 with Rooted Asus Fonepad ME175CG and Android Lollipop.
Obviously the problem is with Android Audio Stream System. At some point the voice disappears, and the program needs restart. After days of experimenting finally I did the following:
1. The sys.txt inserted in the .apk has the following lines:
3. I installed the program.
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This solution has worked fine with an old .csv voice for two days, but I am afraid this is not the best solution. If someone has an experience with the problem, please share it.