simple way to add harmonics to a fundamental signal

[Thomas Robert de Massy]

Hi,
   I'm currently designing a VCO, and I want to add 3 or 4 harmonics to the fundamental signal. Right now the only way that I've found is to add one oscillator for
every harmonics, but since my oscillator will be complex (square,triangle,sin,saw,etc)
the circuit will be very complex and painful to make (it will be a 8 notes polyphonic synth). I thought that there may be a simple way to do this, for example sending the fundamental signal to a part of the circuit that would add the harmonics. Anyway I have no clue of what I should look for. Anyone have some suggestions or schematics ?

Thanks
Thomas
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