Kepra

Special launch price!

Kepra is a rhythm instrument developed through detailed analysis of an original Japanese vintage programmable rhythm machine.

Rather than relying on sampled sounds, Kepra recreates each instrument by studying the original analog circuits, measuring waveforms, analyzing spectral content, and reproducing their behavior in software.

The objective was not simply to imitate the sound of the original machine, but to understand how it worked—and to rebuild that experience as a modern instrument.

Features

• Hardware-analysis-based drum synthesis
• 12 drum voices
• 16-step sequencer
• NOTE / FLAM / ACC layers
• 8 pattern banks
• Stereo mixer
• Drive and Character section
• Internal, host, and external MIDI clock
• AUv2 and VST3 for macOS
• VST3 for Windows

Hardware Archaeology

Developing Kepra felt less like sampling a drum machine and more like studying an archaeological artifact.

Every instrument was investigated through circuit analysis, waveform measurements, timing analysis, and spectral comparison to better understand how the original hardware produced its sound.

Rather than reproducing recordings, Kepra attempts to reconstruct the behavior behind them.

The Missing Instrument

One voice in Kepra did not exist on the original hardware.

The Shaker was designed as an “imaginary expansion”—a voice inspired by the architecture and character of the original instrument.

Instead of adding a modern sample-based shaker, it was developed by asking a simple question:

“If the original designers had decided to include a shaker, how might they have built it using the same technology?”

The result is not a historical reproduction, but a speculative reconstruction that aims to remain faithful to the design philosophy of the original machine.

Not an Emulator

Kepra is not intended to be a museum piece.

It is a modern rhythm instrument built from careful hardware analysis, extending the ideas of a classic Japanese drum machine into new creative territory.