Why do the CDs/tapes have a hissing scratchy sound?
The scratchy sound is caused by the boosting of the high frequencies by the Electronic Ear. The more highly filtered a tape is, the more scratchy or static sound it will have. This sound is not white noise as it contains varied frequencies depending on the music. The sudden boost to the high frequencies is what stimulates the ear and brain. It is a very important part of the therapy program and it is definitely meant to be there. Many people prefer the highly filtered tapes once their ears become accustomed to the sound. Basic Kit CD 4 is filtered to 8,000Hz all the way through. On some tapes there is a short passage at the end that is also very highly filtered and sounds completely different to the rest of the tape. This is done intentionally so that the music plays right to the end of the tape so as not to leave you wondering if the tape has finished or not. If you find the music is disturbing you, please turn down the volume, and feel free to have it on while you are doing other thi
