Roland D-550 Linear Synthesiser Rack Mounted Unit

The Roland D-550 brings the iconic “LA-synthesis” engine of the D-50 into a compact, rack-mountable format. Offering lush pads, shimmering bells, punchy basses, and complex textures in a pro-ready 19″ chassis. With 16-voice polyphony, built-in effects, full MIDI I/O and a deep edit architecture, it remains a go-to digital synth for vintage tone, studio work, or modern production rigs.

• Digital rack synth module using Linear Arithmetic (LA) synthesis, combining PCM-sampled attack transients with digital sustain waveforms for rich, hybrid sounds. 
• 16-voice polyphony, capable of complex pads, layered textures, and multi-note chords. 
• PCM + digital oscillator engine: includes PCM-based samples and synthesized tones, plus a resonant low-pass Time-Variant Filter (TVF), amplitude envelopes, and modulation with 3 LFOs for expressive sound design. 
• Patch memory: 64 internal patches; 16 types of reverb for built-in effects. 
• Effects on-board: includes reverb and chorus (and other effects depending on patch/setting), helping shape ambient pads, leads, or atmospheric tones. 
• Connectivity: full MIDI In / Out / Thru, making the D-550 easy to integrate with keyboards, DAWs, or sequencers for modern rigs. 
• Rack-mountable 2U design. Ideal for studio racks, live rigs, or compact setups needing power-synth versatility without built-in keys.