Our best example: The Yamaha PSS-390.

From Childhood Bedroom Memory to Sound Design Tool

In 1991, priced at 399 DM, the PSS-390 was a classic home keyboard for beginners. When we later upgraded to professional workstations like the Yamaha SY55 or the Korg X3, the little plastic device vanished from our radar—just as it did for so many others.

Yet years later, our professional foundation reminded us of the architecture slumbering beneath that unassuming plastic housing: a pure, two-operator FM synthesis engine with sliders for direct access to the frequency spectra.

Old Knowledge as an Effect Catalyst

We went out of our way to reacquire a PSS-390 a few years ago. Not out of nostalgia, but as a precise tool for modern sound design. The trick isn’t just the device itself, but the way we integrate it into our signal chain:

• The Chain: The signal from the “cheap” keyboard is routed through a high-end, analogue effects chain.
• Vintage Refinement: We utilize genuine vintage phasers, analogue delays, and a physical spring reverb.
• The Result: By combining the sharp digital edge of FM with the harmonic distortion of rare analogue gear, we create sounds that come dangerously close to a legendary Yamaha DX7—but with a texture and unpredictability that no standard preset in the world can replicate.

What Does This Mean for Our B2B Clients?

This approach is the ultimate expression of our philosophy: technical expertise trumps big budgets.

• Exclusive Sound Assets: We deliver sounds that cannot be found in any commercially available sample pack. We “build” sounds from sources that others have long since thrown away.
• Efficiency Through Knowledge: We know exactly which frequencies of a budget microchip need to be boosted to make them shine in a professional production (e.g., for software notification sounds or gaming atmospheres).
• Creativity Without Limits: We refuse to be restricted by industry standards. If a 30-year-old toy keyboard provides the perfect fundamental tone for your project, we will use it—and refine it with the expertise gained from three decades of audio production.

In the end, the only thing that matters is what comes out of the speakers. Whether the source was a €5,000 synthesizer or a 399 DM home keyboard is irrelevant, as long as you master the mechanics behind it.

We hear the potential where others only see plastic.

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This Device is Not a High-Fidelity Wonder

…but rather an experimental sound station. It delivers metallic, dense textures that are perfectly suited for industrial, ambient, or percussive experiments (like our condom samples).

Materials (Shopping List) for the €50 Plate Reverb

Wood & Metal:

• Wooden slats: approx. 3–4 pieces (Dimensions: 2 x 50 x 200 cm)
• Trapezoidal metal roofing sheet: 100 x 100 cm (aluminum or galvanized steel)
• Accessories: Wood screws, metal brackets, 4 tension springs with eyelets, 4 screw hooks (with wood thread), metal screws, and nuts.

Electronics & Audio:

• 1 surface transducer (Exciter): 20 to 30 watts (acting as the “transmitter”)
• 2 to 6 piezo pickups: (acting as the “receivers”)
• Connectors: Several jack sockets (mono), some wire/stranded wire, adhesive tape.

Tools:

• Cordless screwdriver, drill, soldering iron, pliers.

DIY Guide for the €50 Plate Reverb

Step 1: The Frame (The Skeleton)

First, build a sturdy frame from the wooden slats with an inner dimension of 110 x 110 cm.

Screw the slats together using metal brackets.

Stability Trick: Screw short cross-pieces (feet) onto the underside of the frame. This keeps the frame stable and prevents the wood from warping easily.

Step 2: The Suspension (The Decoupling)

Screw the 4 screw eyes (hooks with wood thread) into the inside corners of the frame.

Drill a hole into each of the four corners of the corrugated/trapezoidal sheet metal.

Hang the sheet metal inside the frame using the tension springs.

Important: The metal sheet must swing freely and must not touch the wood anywhere. The springs ensure that impact noise from the floor is minimized and allow the metal sheet to develop its own resonance.

Step 3: The Driver (Input)

Drill a hole into the metal sheet (in the center, or slightly offset for different resonance modes).

Screw the surface transducer (tactile transducer) firmly onto the metal sheet.

This is your “Input.” The signal from the mixing console (Aux Send) is fed in here. Since the transducer requires power, it is recommended to place a small, inexpensive Class-D amplifier in between.

Step 4: The Pickups (Output)

Now the piezos come into play.

Attach the piezo elements to various spots on the metal sheet using tape.

Experiment here: It will sound different in the troughs of the corrugated sheet compared to the ridges.

Solder the piezos to the jack sockets, which you can mount on a small wooden board attached to the frame.

The Concept: Shaping Sound Through Density

The unique aspect of this setup is the use of multiple piezos. Because the corrugated sheet metal generates complex reflection patterns due to its shape, each piezo captures the reverb with a time delay and a distinct tonal character.

Pro Mixing Tricks:

Route the individual piezo signals back into your mixing console separately.

• Panning: Pan two piezos hard left/right to create a wide stereo image.
• Summing: Blend multiple piezos together to “thicken” the density of the reverb.
• EQ Ducking: Since corrugated metal is prone to metallic “clattering,” slightly cut the midrange frequencies on your EQ to simulate a deeper, darker space.

Don’t expect a Lexicon-style reverb. What you get instead is a unique, mechanical effect that is alive. It reacts to the dynamics of your music, physically vibrates in the room, and gives your productions an organic texture that no plugin can “easily” replicate. It is ideal for anyone looking for the beauty in imperfection.

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