The A-114 has two identical Ring Modulator circuits which output the product of the signals at inputs X and Y. The ring modulator is a refinement of amplitude modulation (AM).
Ordinary amplitude modulation will output the original carrier frequency (fc) as well as the two side bands (fc-fm, fc+fm) - but ring modulation cancels out the carrier frequencies, and just lets the side bands pass to the output.
A ring modulator can help produce dissonance, such as used for bell type sounds.
