PPG Wave 2.3 (1984)
Eight voices of digital wavetables pushed through analog filters - a hybrid that still sounds like nothing else, provided you can keep one alive.
Overview
The Wave 2.3 is the machine that made the PPG name mean something to players who couldn't afford the full Music Computer System. The flagship rig paired the synth with a Waveterm workstation. The 2.3 stood on its own as an eight-voice digital synthesizer with MIDI and an onboard 8-track sequencer. When Europa Technology brought the PPG line to the States, Polyphony (October 1984, p.39) listed the Wave 2.3 at $895. That made the eight-voice digital engine the entry point into PPG's world rather than the top of it. The Waveterm itself ran $11,995, the PRK processor keyboard $2,995, and the rack-mount Expansion Voice Unit $6,995, so the 2.3 was the component most players could actually justify.
What they got for that money was a hybrid instrument.
The voice architecture is where the 2.3 earns its reputation. It works out to sixteen digital oscillators driving eight voices, as Sound on Sound UK (December 1996, p.263) noted in a retrospective. The same piece described the 24 dB/octave analog low-pass filter as the element that lets the instrument move from obviously digital to genuinely mellow, depending on where you set it.
Envelopes are generous by the standards of the day: two ADSR generators plus one AD-only envelope. The interesting trick is that you can assign an envelope to force the oscillator to cycle through a given wavetable. That turns the envelope into a sound-shaping tool rather than just an amplitude contour. Sound on Sound UK (December 1996, p.263) called the result some extremely complex sound sources, and credited it with helping make the Wave a unique machine in its day.
Programming is where the 2.3 separates the committed from the curious. The Data Transfer modes are, in the words of Sound on Sound UK (December 1996, p.264), equally cryptic. The interface assumes you'll read the manual. The Basis control handles pan, and combined with the various oscillator cycling modes (up, down, up-and-down, random, or moving), it becomes a rhythmic tool for sequencing rather than just a stereo placement knob. Players who put in the time get parts out of it that don't sound like anything else in the rack. Players who don't tend to sell them.
Connectivity reflects the era.
Diagnosing faults means opening the case, and on a Wave 2.3, you will be opening it.
The 2.3 is the eight-voice digital synth at the center of the Music Computer System, the component that the Waveterm, PRK, and Expansion Voice Unit were built around. Mix (September 1984, p.175) framed the whole system in terms of European craftsmanship, reliability, and innovation.
Anyone shopping for one today should go in with open eyes. The sound is sixteen oscillators, eight voices, and a wavetable architecture. It's not a synth you buy to play presets.
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