Algorithm to mix sound

Question

I have two raw sound streams that I need to add together. For the purposes of this question, we can assume they are the same bitrate and bit depth (say 16 bit sample, 44.1k

Answer 1

convert the samples to floating point values ranging from -1.0 to +1.0, then:

out = (s1 + s2) - (s1 * s2);