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For avoiding "cheapie sound" distortion like a thin veiling smokescreen specific to LDAC Bluetooth earphones and DAC's under $30 (probably), this module sets near ideal re-sampling which involves special digital filtering at the system-wide mixer.
Android app for ESP32 Bluetooth speaker control. Features DSP/EQ controls, LDAC/aptX/AAC codec selection, LED matrix effects, real-time audio visualization, OTA firmware updates over BLE. Control bass boost, channel flip, 3-band equalizer for your DIY Bluetooth speaker project.
Setting re-sampling parameters of AudioFlinger (the system-wide mixer) so as to improve audio quality of DAC's under $30 and LDAC BT devices especially