libZPlay implements programmable equalizer processor with following features:

• create custom frequancy bands
• preamp gain in millidecibels
• control each band gain in millidecibels

Note: By default, equalizer processor is disabled. User must enable equalizer using EnableEqualizer or zplay_EnableEqualizer. 

New instance of ZPLay class has 10 default equalizer bands. 

int FreqPoint[9] = {115, 240, 455, 800, 2000, 4500, 9000, 13000, 15000};

• band0: 0 - 115 Hz
• band1: 115 - 240 Hz
• band2: 240 - 455 Hz
• band3: 455 - 800 Hz
• band4: 800 - 2000 Hz
• band5: 2000 - 4500 Hz
• band6: 4500 - 9000 Hz
• band7: 9000 - 13000 Hz
• band8: 13000 - 15000 Hz
• band9: 15000 - Samplerate/2 Hz

User can create custom bands with SetEqualizerPoints. 

To change gain of specified band use SetEqualizerPreampGain. 

To apply equalizer, use:  

Effects