"Oh, so they have the internet on computers now?" Homer Jay Simpson
Some features of this page may not work properly because scripting is disabled in your browser.
Note: this page describes Twizla 3, which is not free. Details of the free version (Twizla 2) can be found here: Twizla 2 (free) page 
Download Twizla 3
Click the following link to download the 29.2MB installation file. Install Twizla 3 by running the downloaded file:
Download Twizla 3
Read the latest release notes here:
Release notes (v1.03)
Purchase a licence for Twizla 3 via the PayPal button below. A licence costs GBP14.00 and enables all program features disabled in the unlicensed version.
Note: if you have security issues with your browser when downloading the above .exe file, the following link is to the same file in a zipped archive; you should be able to download this file with no problems, but you will need to extract the .exe file from the archive after downloading:
Download Twizla 3 (zip)
 
Twizla 3 is an audio program that creates music and sound effects, intended to be relaxing and calming. Several preset sessions are provided for easy playback; the presets also form the starting point for creating your own sessions. All of the parameters of the session are easily editable, and the edited session can be saved for further editing and playback. With the licensed version of the program, the audio from a session can be exported as a Windows WAV audio file. For more information, please see the Twizla 3 FAQ.
Examples:
Some example pieces created with Twizla 3 can be found on the Sounds page.
System requirements:
Windows XP SP2, Windows Vista, Windows 7; soundcard with 44.1 KHz, stereo headphone output.
Installation:
Use the link at the top of this page to download the file twizla_3_install_v103.exe, a 19.23MB, self-extracting and installing compressed file. Run the downloaded file to install Twizla 3 on your computer. (Note that you must have Administrator's rights in Windows). The software can be uninstalled using "Add/Remove Programs" from Windows Control Panel.
Registration and licensing:
Some features of Twizla 3 are not available until you register the program and obtain a licence. A single-user licence costs GBP14.00 and can be obtained by clicking the 'Buy Now' PayPal button on this page. Payment can be made either from your PayPal account, or by credit or debit card. When your payment has been approved you will be emailed a Registration Code which should be entered into Twizla 3 in the dialog accessible from the program's Help/Registration menu. All program features will then be fully enabled.
Screen shot
Main window

Twizla 3 FAQ
How does Twizla 3 work?
The output from Twizla 3 is a combination of up to six audio components. Not all of the components need to be present, or may be present for all or some of the session. The volume of each component for the session is controlled by an easily-editable envelope. The six available components are:
  • A binaural beat; this is an auditory illusion that tricks the brain into hearing a tone which would otherwise be at a pitch too low to be perceived. This is achieved by taking a carrier frequency in the normal range of auditory perception, and presenting it to each ear at slightly different frequencies, the difference being the required pitch. For example, taking a nominal frequency of 440.0 Hz (the A above middle C) and playing a tone at 435.0 Hz to the left ear and a tone at 445.0 Hz to the right, the brain will perceive the difference (the binaural beat) of 10.0 Hz.
    The binaural beat frequencies are in the same ranges as the predominant electrical activity associated with certain types of brain activity, i.e:
    • Beta (13 to 39 Hz): active thinking, cognition
    • Alpha (7 to 13 Hz): relaxation; pre-sleep drowsiness
    • Theta (4 to 7 Hz): dreaming, meditation REM sleep
    • Delta (0.5 to 4 Hz): deep sleep
    The theory of brainwave entrainment proposes that sensory stimulation at a particular brainwave frequency helps the brain to reach that state. There is a full (and fair) discussion of entrainment theory at realization.org. Twizla 3 makes no specific claims in this regard, but it does provide the facility to experiment. As well as a volume envelope, the binaural beat has a frequency envelope, which allows the binaural frequency to be changed throughout the session, for example starting as a Beta frequency, and gradually changing to a slower, and perhaps more relaxing, Theta wave.
  • An amplitude-modulated component: similar to the binaural beat, except that the beat frequency is achieved by varying the amplitude of the carrier frequency, which is a monophonic tone. Being monophonic, the modulation can be heard over loudspeakers, and does not have to be listened to on headphones. Like the binaural beat, the carrier frequency for the modulation is set (for the duration of the session) by choosing an octave and a note. The frequency and volume of the modulation itself are controlled by envelopes.
  • Three different kinds of noise components: white, pink and brown noise. These types of noise are technically defined by their power distribution in the frequency domain. Subjectively, pink noise sounds less 'hissy' and more filtered than white noise, and is more natural-sounding. Brown noise sounds even more filtered than pink noise. Each noise component has its own volume envelope.
  • An accompanying soundtrack component: this can be any music or sound effect file, in the Ogg/Vorbis compressed format (see What is an Ogg file? for more details of Ogg files and how to create them). The soundtrack volume is controlled with an envelope. The soundtrack playback can be delayed, and playback of soundtracks shorter than the length of the session can be looped.
Some or all of these components combine to make up a Twizla 3 session, which can vary in length from 5 to 60 minutes. The resulting audio can be exported and saved for further editing or sharing.
Can I create my own sessions?
Yes. Twizla 3 contains an editor for creating your own sessions, using one of the preset sessions as a starting point. The session can then be saved as a Twizla 3 (.tw3) file.
What is a Binaural Beat?
A binaural beat is an auditory illusion that tricks the brain into hearing a tone which would otherwise be at a pitch too low to be perceived. This is achieved by taking a carrier frequency in the normal range of auditory perception, and presenting it to each ear at slightly different frequencies, the difference being the required pitch. For example, taking a nominal frequency of 440.0 Hz (the A above middle C) and playing a tone at 435.0 Hz to the left ear and a tone at 445.0 Hz to the right, the brain will perceive the difference (the binaural beat) of 10.0 Hz.
What are OGG files?
Ogg Vorbis is an audio compression and storage format, comparable to other formats used to store and play digital music, such as MP3, WMA, AAC etc. It differs from other formats in that it is completely free, open, and unpatented. Its file size is also smaller than MP3, and it sounds better!
Ogg Vorbis already enjoys widespread software player support and is compatible with several major hardware players. For more information about Ogg Vorbis, including details of currently available encoder applications, see the Ogg/Vorbis website.
Can I record the audio from Twizla 3?
The licensed version of Twizla 3 has an 'Export' function which allows you to export and save a session's audio output as a standard, uncompressed, windows WAV file.
What is brainwave entrainment?
Brainwave entrainment is based on the theory that certain recognizable patterns of electrical brain activity are associated with different states of mind. For example, brain activity characterised as 'Alpha rhythms' (7 to 13 Hz.) is associated with calm, reflective states. The theory proposes that sensory stimulation at the desired frequency can help the mind to reach the corresponding state. Various devices and techniques are marketed: light spectacles, hemisynchâ„¢ sound etc.
No claims are made for Twizla 3 in this regard; however, if you'd like to experiment, Twizla 3 can help. There is a full (and fair) discussion of entrainment theory at realization.org.
Is Twizla 3 free?
No. Twizla 3 is released as a downloadable trial version, which you are allowed to use, for a reasonable period, for evaluation purposes. After this time, further use requires that you register the software and obtain a licence. See Registration and Licensing for more information.
Useful links:
For more information about photic stimulation, binaural beats, brainwave entrainment, and bio-feedback in general, see the Mind Machine FAQ at Realization.org.
For more information about Ogg/Vorbis - what it is and why it's needed - see Vorbis.com.
Some of the sound samples used in Twizla 3 are from the very useful Freesound Project, and are used under the terms of the Creative Commons Licence.
Site design © Andy Bridle, 2009-2012
For enquiries, support and feedback, please go to the contact page.
Visit my Facebook page.