The synaesizer is an audiovisual databending project by Exomène (exomene.com/) in collaboration with Dorianne Wotton (dorianne-wotton.com/)

You can watch an excerpt of the installation here: vimeo.com/34809025.
It has been presented in several exhibitions using pictures from the series "Visions désaturées" (dorianne-wotton.com/fr/portfolio-11272-3-9-visions-desaturees.html).
Learn more about the synaesizer on exomene.com/?article=120 and exomene.com/?article=125

Le synesthéseur est un projet de databending d'Exomène (exomene.com/) en collaboration avec Dorianne Wotton (dorianne-wotton.com/)
Vous pouvez voir un extrait de l'installation ici: vimeo.com/34809025
Le dispositif a été présenté dans le cadre de plusieurs expositions, issues des séries "Visions désaturées" de Dorianne Wotton ( (dorianne-wotton.com/fr/portfolio-11272-3-9-visions-desaturees.html).)
Vous voulez savoir comment ça marche?
dorianne.wotton.over-blog.com/article-le-synestheseur-comment-a-marche-92012485.html

More?
A synæsizer is a device that makes you see what it hears and hear what it sees. Thus, it turns you into a synesthete, just like Kandisky, who could hear music in colours or Nabokov, for which letters would conjure up colours. 
To do so, it is an artificial synesthete in itself: its video system is directly plugged into the audio and vice-versa. If we compare it to a human being, it can hear with its eyes and see with its ears and what it sees alters what it hears, which endlessly alters what it sees...
Technique
The technique used here is the "databending", which is a form of "hacking" in the primary meaning of the word. Files or datastreams, whatever their original purpose is, are interpreted as audio files. Raw data often generates raw sounds, this is why Exomène developed a specific interpretation and refining process, partly based on spectrogram's analysis and power spectral density.
Enough with theory! I wrote a step by step explanation.
Synesthesia
Databending does not apply to computers only. Like it's altering the semantics of signs, databending is possible with all symbol systems such as the human brain. When a human brain bends data, it is also synesthesia: union of the senses, etymologically.
This device is therefore an artificial (multimodal and bidirectional) synesthete, its senses having been melt together. But that quality of being a synesthete is only the consequence of its primary function, which is to generate a synesthetic experience on its user. It's an artificial synesthetic generator, what can be called a synæsizer.

The synaesizer - Passage from Dorianne Wotton on Vimeo.