The fourth Interaction is very sustained, very quiet, and may be played even slower than marked if appropriate. The rich chordal harmony in the treble register is devised by distorting a tonality formed from the Slonimsky pattern 30.
This distortion is achieved by passing white-noise samples at a specific amplitude through 14 repetitions of the tonality. As in the previous Interaction a template is devised onto which the distorted chords are placed. The layout of this template evolves after two bars and in the gaps that form between the chords there is placed a melodic texture made specifically from the tonality of each distortion.