The Yamaha PSR-9000 is a 61-key arranger workstation with a synth-action keyboard. It features 126-voice polyphony, a large LCD display, and extensive connectivity, including MIDI in/out ports, USB MIDI, and a SCSI terminal. It has expandable memory, allowing for a maximum of 65MB RAM, and can accommodate an internal hard drive up to 8GB. Yamaha PSR-9000 Arranger Workstation The Yamaha PSR-9000 is a professional-level 61-key arranger workstation keyboard released in 2000. Here are some of its key specifications: Keyboard: 61 keys with velocity and aftertouch. Polyphony: 126-note polyphony. Voices: 331 original voices and 480 XG voices, including 14 drum kits and 2 SFX kits. It features 32 MB of internal voice memory. Sequencer: Dedicated 16-track sequencer with a capacity of 38,000 notes. Storage & Expansion: Sampling RAM expandable ...