Here is an overview of the constants used in the library.
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#define SSDA_VERSIONSTRING "1.0203"
// Sound Mode Flags
#define SSDA_MODE_MONO_BRIDGE 0x02 // Use both PWM pins for more power
#define SSDA_MODE_AUTOWORKER 0x80 // Use this and worker is called automatically
// Error codes from SimpleSDAudio, see other sd_l*.h for more error codes