Permeation is a composition written for solo clarinet and live performance or tape version of the clarinet created using Modalys, a coding language of Physical Modeling Synthesis developed by IRCAM. It explores a variety of sounds by manipulating the pipe radius and pipe length, which are parameters of the closed-open tube representing the reed and the clarinet body in the Modalys script. When the radius decreases, the size of the air passage decreases, resulting in a sharp sound with increased air pressure and tension, and the pitch changes according to the length. Especially, I incorporated wind sounds generated by manipulating the air pressure through a small hole in the pipe. I also utilized the physical sound resulting from rapid changes in the pipe's radius while injecting air, emphasizing the connection to the principles of physics. This piece specifically examines the diverse musical applications of Modalys coding as an instrument, drawing a parallel to how contemporary music utilizes extended playing methods with traditional instruments.

The performance is controlled and played using Max and a MIDI keyboard, synchronized with the actual clarinet player, and incorporates elements of accidental randomness. The piece expresses the intertwining permeation of these two clarinets as a duet. The composition is divided into two methods of performance: real-time performance by two players, including the clarinet player and a MIDI keyboard player, and a tape part using fixed media with only one clarinet player. This score is written for the real-time performer version.

The tape part of the composition is created solely using the manipulated Modalys Clarinet sound. This unique sound source is processed using sound editing techniques and algorithms within MAX/MSP. Additionally, it is possible to incorporate reverb and delay effects during the live performance on stage.