Fluctuations Magnétiques is composed of two processing stages with two analog filters each. The circuits feature high-pass, band-pass and low-pass modes with a slope of -12 dB per octave. Routing options allow serial or parallel operation. Level potentiometers at the input stages make it possible to generate asymmetrical distortion. By connecting several of the VCFs in series, users can create filter types with a slope of up to -48 dB per octave. For modulations, there are several CV inputs.
The basic character of the Fluctuations Magnétiques is gentle and very musical. However, with high input level settings, it is also possible to achieve beefy, rather rough results. The circuits can’t self-oscillate, unless the user patches a feedback loop. Parallel routing allows, in combination with a VCO, VCA and some modulators, lively, very expressive basses, leads and pads. Atmospheric stereo processing and vocal sounds are other areas of expertise.