The Make Noise FXDf Fixed Filter Synth Module is a 6-band fixed filter module, with simultaneous 6dB/octave and 12dB/octave inputs, and an individual output per filter band. The FXDf is a 6 Band Fixed Filter. Traditionally fixed filters are large modules having 8 to 10 bands, each with a manual level control, but rarely any voltage control.
The FXDf is so small Make Noise had to abbreviate the words Fixed Filter and by providing individual outputs as well as a header for normalled connection to their RxMx 6-channel macro-lowpass-gate module, voltage control over level of each band is possible through patching. In the past the Serge System Fixed Filter used 6dB/octave filters while the Moog Modular used 12dB/octave filters.
The FXDf also allows for blending of two audio signals. Make Noise selected 6-bands, which were found to produce the most sonic energy in typical Make Noise system patches and also took care to space them wide enough that each of the bands could be distinct from the others. This makes for quite an impactful sound when independently modulating the amplitudes of the 6 bands using the RxMx or VCAs.
The main features of the Make Noise FXDf Fixed Filter Synth Module include: