Roland D550 LA Synthesis MIDI Rack Sound Module  

The ROLAND D550 is a rack mount version of the D-50 LA digital synthesizer. Like the D-50, the D-550 utilizes 32 partials and seven structures for synthesis. Each partial functions as a complete synthesizer. A partial consists of a wave generator and Time variant filter. The partial's wave forms are PCM format. The D-550 is bi-timbral, allowing two sounds to be played via keyboard or two simultaneous midi channels. As in the D-50, three digital effects are included - Reverb, Chorus and Equalizer (all programmable per patch). 

Actual unit -

This Roland D550 is used, but in great condition. Owner’s manual is included.

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