Description | The DS55 is the same as the YS200 but lacks aftertouch, and card interface. It adds a arpeggiator. There is also a EOS DS55 a "classroom" version for educational purposes. This came with Japanese overlay, speakers and stand. Some preset sounds are different.
The DS55 is a 4-operator digital FM synthesizer in a rather funky looking keyboard design released in 1988. It featured an 8-track on-board sequencer with many advanced edit functions and up to 8 song capacity. It has a 61-note velocity/aftertouch sensitive keyboard, can hold up to 300 patches, two LFO's, vibrato, and more. It tends to produce very deep dance/techno basses, eighties digital synth sounds, and new age sounds.It uses the same synthesis as the TX81Z, which means it has 8 waveforms to choose from rather than just sinewaves, which gives it a wide range of possible sounds.
The complexity of FM synthesis is somewhat relieved by the "Easy Edit" controls for basic editing operations, but this can also be limiting since not all parameters are accessible. Full editing of the patches requires a MIDI based patch editor, such as YSEditor, which is available for free but only for the Atari ST. Fortunately, it works on Atari ST emulators for the PC. It's worth the trouble because it allows you to load up your DS55 with original patches from the TX81Z and some of Yamaha's other classic 4-operator DX synths, making the DS55 a good way to get your hands on classic patches from several keyboards all in one box.
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