Viper4android not working on rooted galaxy s4 i9505 crdroid marshmallow 6.0.1

I installed busybox, disable the audiofx, changed selinux to permissive and installed viper4android.apk on rooted galaxy s4 i9505 crdroid marshmallow 6.0.1. Everything seems to be fine but viper4android not working. No sound improved.
Please help me to fix this problem

Thanks,
Zohaib

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