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The FXDf, or Fixed Filter, from Make Noise is a 6 band filter with fixed band peaks. It contains two inputs, one for a -6dB slope on the bandpass filters, and one for a -12dB slope. Traditionally, Moog's fixed filters were known to be -12dB slopes, while Serge's were -6dB. These two inputs also make the FXDf into an esoteric mixer. Each of the six bands have their own individual outputs for signal spilting, strange filter morphing (when mixed with volume controls), and EQ options. The highest and lowest bands are highpass and lowpass respectively, without the highest highs or lowest lows removed. For the quickest and easiest way to shape a tone, the FXDf filter delivers.