Adding sinusoidal signals?

Question

Signal processing

You need to get sound from many simple waves of different frequencies. As I understand it, this can be done by folding waves, but I did not find a clear answer how this is done, I will be grateful for any hints.

Answer 1

Add up in the literal sense, i.e. y(t) = sin(w_1 * t + phi_1) + ... + sin(w_n * t + phi_n),
where w_n and phi_n are harmonic frequencies and phases.