YAMAHA PSS-31

main features: 49 midsize keys 2 built-in speakers (reasonable quality, stereo) polyphony up to 12 notes (including rhythm, accompaniment etc.) 100 preset sounds: only 40 normal sounds 16 layered sounds ("dual voice") 11 key split combinations 5 with sustain 13 "harmony voices" (employ duo, trio effect etc., only monophonic playable) 15 with echo effect 50 preset rhythms 20 preset "jam track" rhythms {dance, rap, funk, soul ballad, minor blues, heavy metal, boogie woogie, rock &roll, r&b, slow rock, jazz blues, jazz waltz, fusion, bossa nova, samba, tango, ska, country, march, new age} preset sounds, rhythms, jam tracks & demos selected by 10 cipher buttons or +/- buttons and "music mode selector" knob {power off, style, voice, song} combined single finger & fingered accompaniment (only standard chords) volume +/- buttons (16 steps) tempo +/- buttons (51 steps) 4 drumpads with 4 drum sets {base, snare, closed hihat, open hihat | crash cymbal, low tom, mid tom, high tom | tekkno base, snare, closed high hihat, open high hihat | closed hihat, low synth tom, mid synth tom, high synth tom} "AWM" wavetable sound generator with sounds based on medium resolution samples with partly complex volume envelopes (those e.g. simulate echo) and high sound quality (16 bit?). CPU "Yamaha YMW270-F, 9224 AEFB" (80 pin SMD) + separate ROM "©1992 Yamaha, XL437CO" (32 pin DIL), crystal clocked 20 lovely demo melodies (wonderful complex polyphonic orchestrations) "minus one" function (mutes...