Yamaha PortaSound PCS-500 Keyboard

FEATURES
49 midsize keys
2 built-in speakers (reasonable quality with some bass, mono sound is routed through a stereo chorus)
main voice polyphony only 7 notes (only 3 with accompaniment, 2 in duet mode)
10 semi- OBS preset sound {organ, trumpet, saxophone, piano, guitar | piccolo, violin, oboe, harpsichord, music box} selected by 5 locking buttons + bank a switch button.
changed preset rhythm order (10 semi- OBS preset rhythms {disco, jazz rock, rhumba, swing, march | 16 beat, bossanova, samba, slow rock, waltz} )
duet mode button switch
fill-in & stereo symphonic buttons
single finger & fingered accompaniment (manual organ chord with rhythm off)
partly more complex accompaniment behaviour, but only 1 chord timbre
slide switches for rhythm & accompaniment volume (each 5 steps including mute)
no arpeggio
sound generator resembles Yamaha PC-100, but has less aliasing noise and sounds warmer.
simple sequencer (monophonic record/ playback with rhythm & accompaniment, no edit)
tuning trimmer
built-in handle & keyboard lid
jacks for AC adapter, line out, headphone, microphone & analogue volume pedal