I've tried ViPER4Android in both XitROM and SphinX. On both of them, V4A doesn't work. After driver installation completed and restarted my device, it asks for driver installation again. But in audio_effects.conf, there's already V4A library path. The problem is, why the driver library is not loaded? And can V4A really be installed in these 2 ROMs? (I think it shouldn't work in stock too - I don't want to redownload a huge ROM)
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