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7 for the free version, 14 I think for the paid (I don't have the paid). It works better for me on my Nexus than Equalizer by SA labs did. For some reason the Equalizer wouldn't keep my settings.
I have the same volume no matter what the number is. I've tried at 19 and at 3, it's the same.
You have to tell the equalizer to save the settings. Menu - store.
I use Equalizer from SA Labs.

not on mineVolume+ works perfectly fine on non-rooted devices.
Thanks, just did thatThe latest version of V+ has issues... the best bet is to go to the guys web site and sign up for the forums where you can get older versions (or the current Pro version) free of charge.
Volume+ | AndroidAudioHacks