Roland VP-550 Vocal & Ensemble Keyboard

A 49-key vocoder-and-choir machine that weighs less than most gig bags and turns a microphone into an entire vocal ensemble.

Overview

The service documentation for the VP-550 lists its weight at 8.5 kg - 18 lbs 12 oz. That's light for a keyboard with a full vocal-processing engine, an ensemble section, bass and percussion sets, and onboard ambience. It measures 865.4 mm wide, 346.3 mm deep, and 98.6 mm tall. The shallow chassis gives away what it is: a board built around one idea, not a general-purpose workstation.

That idea is the Vocal Designer section. Seven vocal tones are available - CLASSIC, MALE & FEMALE, GOSPEL, POP, VOCODER 1, VOCODER 2, and EXT IN - fed by a microphone through the XLR input.

The vocoder concept is simple. A carrier signal and a modulation signal meet, the vocoder analyzes where the mic's energy sits across the frequency spectrum, and it imposes those bands onto the carrier. As EQ-Magazine (May 2008, p.30) explained, a vocoder has two inputs - an instrument carrier and a mic modulation input - and it opens frequency bands where the mic signal has energy.

The VP-550 hardwires that relationship, with the keyboard acting as the carrier and the mic as the modulator. The EXT IN setting lets an external source take over the carrier role instead, so a guitar or a drum machine can be processed through your voice.

Alongside the vocal engine sits an Ensemble section with six tones: STRINGS 1, STRINGS 2, JAZZ SCAT, MIXED CHORUS, BOYS CHOIR, and HUMMING. The JAZZ SCAT and BOYS CHOIR voices in particular lean into the same vocal-character territory as the Vocal Designer, which suggests Roland intended the two sections to be layered - a vocoded lead over a scat choir, for instance. Polyphony is rated at 128 voices, though the manual notes that this figure changes depending on the sound and playing technique.

The keyboard is 49 keys with velocity sensitivity. That's a compact range, and this is not a piano substitute. It's a performance board for someone who needs vocoder access and choir pads in a rig that fits on a second tier. The D Beam controller sits above the keys for hands-free modulation, and there's a conventional pitch bend and modulation lever for everything else. Octave shift covers plus or minus one octave, which extends the usable range to 61 keys' worth of pitch material without physically adding keys.

Registration memory holds four setups, which is enough to get through a set without menu-diving. The bass and percussion section offers four sets - BASS 1, BASS 2, BASS 3, and PERC - and the ambience engine provides three types: HALL 1, HALL 2, and STUDIO. The manual's factory reset procedure restores the contents of registrations 1 through 4, the volume levels of the bass and percussion sets, and the settings of the Vocal Designer and Voice Expression. Voice Expression's place in that reset list suggests it's central to how the vocal tones respond to playing dynamics.

Input and output facilities are practical rather than expansive. The mic input is XLR, with a nominal input level of -50 to -10 dBu. The external input jack is 1/4-inch, rated at -36 to +4 dBu. Outputs are 1/4-inch L/MONO and R, there's a stereo 1/4-inch headphone jack, and MIDI IN and OUT are on standard 5-pin DIN connectors. Hold pedal and expression pedal jacks round out the rear panel. The power supply handles AC 115 V, 117 V, 220 V, 230 V, and 240 V at 50/60 Hz, so importing one is easier than it might otherwise be. The unit shipped with a power cord in the appropriate voltage variant, an owner's manual, a safety leaflet, and a leaflet titled "Mics recommended for the VP-550." Roland clearly knew the mic choice would make or break the experience.

One detail that surfaces in the service documentation rather than the owner's manual is the system update procedure. The VP-550 uses flash memory for its system program, and updates are distributed as Standard MIDI Files. The process requires a MIDI sequencer capable of playing back SMF data - Roland's own MC-80 is listed as a hardware option, or a PC running UpdSMF.exe through a USB-MIDI interface. The update takes about nine minutes total: roughly eight minutes to receive the data, then automatic writing. The receiving progress is displayed through the twelve LEDs in the VOCAL DESIGNER and ENSEMBLE sections lighting in sequence, and the MIC section's LEVEL LEDs blink during transfer. If the update fails, the procedure restarts from step one. It's a fussy process by modern standards.

The factory reset procedure is similarly non-obvious. It isn't documented in the owner's manual at all, only in the service notes. The sequence involves holding PITCH and EXPRESSION while powering on, then holding MIC ON/OFF while pressing HUMMING, then pressing REC. Worth knowing before buying a used one that arrives with someone else's registrations baked in.

The VP-550 is not a general-purpose synth. There's no traditional oscillator section, no filter controls in the subtractive sense, no arpeggiator or sequencer. It's a vocal and ensemble instrument with a specific palette. The bass and percussion sets give it enough low-end and rhythmic grounding to work as a self-contained accompaniment tool for a solo performer or a songwriter sketching ideas, but nobody is buying this to replace a Jupiter.

Neither is a dealbreaker, but both are worth testing before purchase.

The keyboard action suits the vocal and ensemble tones well. Velocity response is present and useful for the Vocal Designer tones, where harder playing can push the vocoder character harder. The four registration memories mean live use requires some planning, but the front panel makes switching between sounds fast enough for most performance contexts.

The mic input, the vocoder engine, the ensemble section, and the D Beam all serve the same goal: turning a voice into an arrangement. The 49-key range keeps it portable, the 8.5 kg weight keeps it manageable, and the multi-voltage power supply keeps it usable in most of the world.