I am following a sound design course where, among other things, there are patches from one synth that you should recreate in your synth of choice. Having picked serum as my choice, I was surprised to see that serum's square wave in basic shapes wave table introduces small amount of even harmonics. While generally you wouldn't notice it if you just played the sound, it does make a difference when you precisely want to recreate a patch. At first i thought it was maybe some aliasing problem, but after viewing the waveform in the wavetable editor, it is intentional. Why? To give it more analog feel or something?