Yamaha PortaSound PSS390 - Factory Demo

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The best Yamaha PortaSound Keyboard : instrument from 1990 featuring an FM synthesizer that is controlled in a very simplified way through 7 sliders.

Main features:
49 midsize keys
2 built-in speakers (stereo)
100 preset sounds ("voices")
FM "digital synthesizer" controllable through 7 digital slide switches {spectrum, modulation, attack, decay, release, vibrato, volume} with each 8 step resolution.
synthesizer on/ off button (switches back and forward between modified and unmodified sound).
dual voice button to layer 2 voices (1 of them can be modified by sliders, select twice the same sound = chorus effect)
100 preset styles (i.e. rhythms with very richly orchestrated accompaniment)
2 fill-ins + ending for each style
accompaniment mode switch {normal, single finger, fingered, auto bass}
2 tempo buttons (40..240 BPM)
2 transpose buttons (-12..+12 semitones)
simple sequencer "song memory" with 3 select buttons for 3 independent "songs".
FM sound is up to 9 voice polyphonic and very similar like OPL2 (i.e. like PC SoundBlaster FM, but with grittier envelopes and great digital zipper noise during timbre fades) but can do stereo panning effects.
PCM rhythm (uses sampled percussion)
accompaniment volume slider (6 steps)
volume slider
demo button (a well known latin/ fusion music)
jacks for line out, AC adapter