---
title: Hemi-Sync in Expand App
description: "Hemi-Sync® and Monroe Sound Science: the two audio technologies in the Expand app, and how to choose between them."
---
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# Hemi-Sync in Expand App
### Hemi-Sync®
Hemi-Sync®, short for Hemispheric Synchronization, is the original brainwave entrainment technology developed by Robert Monroe, founder of the Monroe Institute. Over decades of research and refinement, Hemi-Sync® has become a trusted method for brainwave synchronization across the left and right hemispheres of the brain, helping users achieve specific states of awareness, whether that's deep relaxation, heightened focus, or expanded consciousness.
Built on the foundation of binaural beat technology, Hemi-Sync®'s simplicity and effectiveness have made it a pioneering tool in the field of consciousness exploration. This technology is still featured in the Monroe Institute's core programs today, where it continues to support participants in achieving profound states of awareness and personal transformation. Its carefully crafted sound frequencies are designed to create coherence in the brain, promoting well-being, stress reduction, and personal insight. Many users appreciate Hemi-Sync® for its well-established and balanced approach, which has been used by millions worldwide to enhance meditative and consciousness-expanding practices.
### Monroe Sound Science
Monroe Sound Science (MSS) is the result of the Monroe Institute's ongoing research efforts and is based on the latest developments in audio production technology as well as our latest understanding of brain activity during profound states of expanded awareness. MSS integrates multiple techniques (including binaural beats, as well as frequency, phase, and amplitude modulation) layered into unique sound patterns designed to guide listeners through specific states of awareness. The latest generation of this technology, MSS-3D, leverages a fully immersive 3D soundstage powered by Dolby Atmos, which enhances the effectiveness of brainwave entrainment by engaging the brain with continuous 3D motion and dynamic spatial audio.
MSS also uses specific techniques to incorporate gamma brainwave entrainment, which is associated with heightened states of perception and awareness. By engaging gamma brainwaves, MSS helps bring more of your conscious awareness into the experience, creating an impactful connection to the deeper levels of your mind. MSS-3D is particularly suited for listeners seeking a deeply immersive and modern approach to reaching transformative states of consciousness.
### Which Technology Is Right for You?
- Choose Hemi-Sync® if you're looking for the original, trusted technology supported by over 45 years of research. Hemi-Sync® uses complex, multi-layered audio signals to create a resonance that is reflected in unique brain wave forms characteristic of specific states of consciousness, such as deep relaxation, focused attention, or other desired whole brain states.
- Choose Monroe Sound Science if you're interested in an immersive experience supported by the Monroe Institute's latest research that leverages advanced 3D spatial audio technology to deepen your engagement with states of expanded awareness.
Both technologies are backed by research and the Monroe Institute's commitment to exploring and expanding human consciousness. Experiment with both to discover which resonates with you most effectively.
The Gateway Experience is a Hemi-Sync product, sold and supported by Hemi-Sync. For purchases and product questions, please visit [hemi-sync.com](https://hemi-sync.com/) or email [interstate@hemi-sync.com](mailto:interstate@hemi-sync.com).
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