Bontempi HF232.20 rare electronic keyboard organ rhythm preset machine SN 40320139

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via this auction

Note the headphone out jack is actually labelled "EAR."

"Main features:
44 fullsize keys

polyphony 8 notes (only 4 with accompaniment)

4 combinable OBS preset sounds {flute, strings, brass, oboe} selected by locking switches

6 OBS preset rhythms {waltz, slow rock, swing, disco, rock, latin} selected by locking switches

vibrato switch

fingered & single finger chord

chord memory switch (means simply that chord is held when releasing keys)

manual chord mode switch (labelled "automatic)

tempo slider

master & rhythm volume slider

main voice is squarewave without envelope, muffled through capacitors

analogue percussion {base, snare, hihat, clave}; cymbals and snare are made from transistor noise.

main ICs "AMI 8233MAB, 27430510" (40 pin DIL) + "AMI 8301XU, 27430520" (24 pin DIL)

mains operated

headphone & line out jack

large built-in speaker (in the case bottom, makes nice bass)"