f32 PI = 3.14159265f;
u32 k;
for (k = 0; k < buffer_size/2; k++) {
	// sounds[0] is 16-bit signed 48,000Hz PCM
	// I want a 220Hz tone.  48,000Hz / 220Hz is roughly 218
	// 48,000 samples/s / 218 samples = 220Hz
	// 0 to PI/2 -> 1 wavelength.  (sin(0) == 0, sin(PI/2) == 0)
	// we want 1 wavelength to fit in 218 samples, so
	// (PI/2) * (k/218.0f) should do that.... right?
	// 16-bit signed samples range from -32768 to 32767 (0x7FFF)
	sounds[0][k] = 0x7FFF * sin((PI/2) * (k/218.0f)); // attempting 220Hz sine wave.
}