This site has inexpensive electro med devices and this link's product relates to the origin of Becks info on this Brain Frequency Tuner type technology. see: Scenar
Many electro med devices can only be advertised as having certain minimal applications(pain reliever, ect) because of FDA restrictions, so we may have to read between the lines to understand a products deeper therapy implications and applications.
Cyma Sound tracks also have easy and inexpensive applicability (download, edit ect)