// Context object
BKContext ctx;

// Initialize context with 2 channels (stereo)
// and a sample rate of 44100 Hz
BKContextInit (& ctx, 2, 44100);

// Track object to generate the waveform
BKTrack track;

// Initialize track with square wave
// By default, the square wave has a duty cycle of 12.5%
BKTrackInit (& track, BK_SQUARE);

// Set mix and note volume
BKSetAttr (& track, BK_MASTER_VOLUME, 0.15 * BK_MAX_VOLUME);
BKSetAttr (& track, BK_VOLUME,        1.0 * BK_MAX_VOLUME);

// Set note A in octave 3
BKSetAttr (& track, BK_NOTE, BK_A_3 * BK_FINT20_UNIT);

// Enable tremolo effect
BKInt tremolo [2] = {20, 0.66 * BK_MAX_VOLUME};
BKTrackSetEffect (& track, BK_EFFECT_TREMOLO, tremolo, sizeof (tremolo));

// Attach track to context
BKTrackAttach (& track, & ctx);

// Define audio data buffer
// As there are 2 channels used, the buffer actually must be
// two times the size than number of frames are requested
BKFrame frames [512 * 2];

// Generate 512 frames e.g. as they would be requested by an audio output function
// Subsequent calls to this function generate the next requested number of frames
BKContextGenerate (& ctx, frames, 512);

// The channels are interlaced into the buffer in the form: LRLR...
// Which means that the first frame of the left channel is at frames[0],
// the first frame of the right channel at frames[1] and so on