Ever since I first laid hands on the legendary Yamaha CS-80, I’ve been chasing that iconic sound in the digital world. There’s something magical about its thick, expressive tones, and now, with UNSTABLE, we have a modern reinterpretation that pushes the boundaries while staying true to the essence of the original.
Analog Oscillators with More Control
UNSTABLE features two independent synthesis layers, each equipped with noise, sawtooth, and pulse wave oscillators. Unlike the Yamaha CS-80, where mixing waveforms was more limited, UNSTABLE lets me freely balance each oscillator’s level, giving me even more flexibility in sound design. The adjustable pulse width and variable-speed pulse width modulation ensure that I can achieve both classic and evolving timbres with ease.
Filters: A Hybrid of Classic and Modern
The CS-80 was known for its state-variable filters, and UNSTABLE brings that same subtractive synthesis magic to the table. The high-pass filter stays true to the original design, while the low-pass filter takes a bold step forward, featuring a Moog-style ladder filter. The ability to self-oscillate opens up vast harmonic possibilities, adding a level of musicality that can make any patch stand out in a mix.
Ring Modulator: A Staple of Expressiveness
One of my favorite features of the CS-80 was its incredibly musical ring modulator, and I was thrilled to see how well UNSTABLE captures this aspect. It comes with an analog-style attack and decay envelope that modulates speed, making it possible to create everything from bell-like chimes to aggressive, metallic textures.
Ribbon Controller: A Game-Changer for Expression
One of the defining traits of the CS-80 was its ribbon controller, which allowed for seamless pitch bending. UNSTABLE replicates this with an innovative on-screen ribbon controller, letting me glide effortlessly between notes with a range of up to an octave. This is a huge plus for expressive lead lines and evolving pads.
Arpeggiator: Expanding the Sonic Possibilities
The built-in 16-step arpeggiator is another highlight, providing variable note and modulation values. While not all features are fully implemented yet, I can already see the potential for intricate rhythmic patterns and evolving melodic sequences.
Drive Circuit: Analog Warmth and Grit
UNSTABLE includes a dedicated drive circuit, adding a layer of analog warmth and subtle harmonic distortion. This is perfect for pushing sounds forward in the mix, making leads more aggressive or giving pads a vintage character.
Effects: Reverb, Delay, and Chorus Done Right
I’m a sucker for great effects, and UNSTABLE doesn’t disappoint. The synth includes the DarkStar Reverb and Delay engines, along with the lush WingMen Chorus. It’s like having a CS-80 infused with the warmth of a JUNO-60 chorus and the depth of an Eventide-style reverb.
Final Thoughts
UNSTABLE is more than just a modern take on the CS-80—it’s a powerful instrument in its own right. It stays faithful to the analog charm of the original while integrating modern enhancements that make it more versatile and flexible. Whether you’re after vintage synth tones or new sonic frontiers, UNSTABLE delivers.
If you’re a fan of the CS-80 or just love expressive, analog-style synthesis, this is one synth you won’t want to miss.
