TTS files are not recorded, you cannot amplify them. This problem is usually solely up to your device and the system in it.
In addition, much has been written about such problems. You can try other engine.
I am using this voice "Voice_TTS_Pro_Nextgen_PT_PT_v4.19", in a multimedia center joiyng brand in the browser "com.nng.igo.primong.palestine" but the voice speaks very low, almost do not hear, besides when talking traffic signs and I'm listening to music even worse or even lower the volume of the music. I'd appreciate your help.
TTS files are not recorded, you cannot amplify them. This problem is usually solely up to your device and the system in it.
In addition, much has been written about such problems. You can try other engine.
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