I worked in a school when I was 17 as a computer tech. They had acorn A3000s with this audio morphing software which ive never seen anything do since.

You put in a small sample - say 1 second of vocal "ahhh" and put another sample in of say a square wave.
You then tell it how long you want to morph to take and it computes the waveform from one to the other.

does anyone know if other software does this ? sort of like a wavetable generator