Crystal River Engineering Inc. was an American technology company best known for their pioneering work in HRTF based real-time binaural, or 3D sound processing hardware and software.

Intel's Virtual Reality exhibit featured multiple Beachtrons and Convolvotrons at the Guggenheim Museum in New York in 1993.

A high-speed, digital-signal processing system capable of presenting eight binaural sound sources in a virtual environment.

A two-board set for PCs, the Convolvotron forms the basis for a range of products, from high-end parallel processors to lower-cost single-source modules.

The system is based on a 15-slot industrialized PC (19-inch rack mount) containing sound source and spatialization cards (as required for a particular application).

Complex multisource models (including reflection and doppler effects) can be achieved with the modular architecture.

[7] As a 3D audio subsystem, hardware and software, it provides a common control interface for a host system.

The hardware that can be used includes the flagship Convolvotron and the low-cost Beachtron that have MIDI synthesis and waveform playback capabilities.

Source:[9] During 1994, an Acoustetron II prototype ran for three months at a modern art center as part of a Virtual Reality exhibit.

It was intended to generate high-end 3D audio on 3D graphics workstations, for use in real-time rendered 3D environments, such as VR rides, training simulators, and virtual prototyping systems.

The sound server supported an ANSI C function interface, allowing interactive control of the 3D audio environment(s).

The mouse is used to place sources in three-dimensions, using a slider for vertical Z adjustment with a 2D plane to position in X and Y directions.