B - Equalizer serves to provide the desired audio effects such as bass booster, reverb, volume booster, power amplifier, and even to change the input output sound gain of music to be stronger. Make your handset or earphone feels pro. This will make Bluetooth audio sound quality much better than before.
With the 15-Band 2/3 Octave Graphic Equalizer you can more freely try to increase the sound quality so that it becomes better. Working automatically when new audio session is detected from media player.

Basic Features for android 7 (Nougat) & 8 (Oreo) :
- 5 Band equalizer.
- Loudness booster.
- Bass Booster.
- reverb.
- 3D Audio Virtualizer.
- FFT sound wave digital Visualizer with OpenGL ES can be set as Live wallpaper or lock screen .

Features for android 9 ( Pie ) and up:
- All Basic features in android 7 ( Nougat ) & 8 (Oreo).
- AutoEQ feature with more than 1000 Equalizer config preset
- 10 / 15 Band dynamic Equalizer (pregain, postgain).
- Multiband channels compressor
config preset in this controller --> ( MBC pregain, MBC postgain, MBC ratio,
MBC Expander ratio, Release Time, Noise gate threshold, Attack time, Knee
width, Threshold)
- Limiter
config preset in this controller --> ( Output postgain, Attack time, Release
time, Threshold, Ratio)
- Input gain booster

android below 9 can't use dynamic equalizer. this features only available for android 9 and up.

the two feature groups above cannot be used simultaneously, except : Bass Booster, Reverb & 3D virtualizer. If you are using 5 Band Equalizer then you have to turn off the 15 Band dynamic equalizer first and vice versa.

AutoEQ is a project for equalizing headphone frequency from jaakkopasanen with MIT License.
https://github.com/jaakkopasanen/AutoEq/blob/master/LICENSE

B - Equalizer was tested and working with Youtube music app + Spotify music app.
Read Instruction for Android 10+ to activate Enhanced method here
https://gonemapps.web.app/barbequalizertos.html

common issue :
1. Visualizer blinking after changing to 3D shader.
Solution : exit app with finish and kill process then reopen app. this should fix this issue.

B - Equalizer all features are available free of charge.
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B - Equalizer AutoEQ Audio SFX