Output channel configuration flags
* SSDA_MODE_MONO - Use only 1st PWM pin
* SSDA_MODE_STEREO - Use both PWM pins for stereo outputor mono 16 bit* SSDA_MODE_QUADRO - Uses four PWM pins for either 4 speakers or stereo 16 Bit* SSDA_MODE_MONO_BRIDGE - Use both PWM pins for more power(mono output only)
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