The Rob Hordijk Dual Fader contains two RMS 'equal loudness' voltage controlled faders with both two inputs and two outputs. Depending on how jacks are connected the basic functions are crossfader, panner or alternating VCA. There are some extra options, e.g. the output from the first fader is internally connected with an extra signal path to the second fader, depending on a switch this option adds the output of the left channel or the crossfade product to the next fader with its own level knob, or make the second crossfader act as a DC-coupled ringmodulator on the first fader crossfade product. Because the midpoints of the faders are at -3 dB to get the equal loudness fader curve the ringmodulation has a compressive distortion that will increase when the modulating level is increased, which sounds like the vintage 'diode-transformer' ringmodulators that were used in the fifties and sixties.
Both second channels on both faders have an extra gain control that can boost up to +20 dB, this is very useful to crack up the level of stompboxes to synth signal level. This way it is easy to use a fader to e.g. crossfade between the input and output of an external guitar stompbox effect or line level effects processor. With some clever routing using the matrix it is also possible to create external feedback paths for external effects and have the feedback under voltage control.
Basically the DualFader is an elaborate voltage controlled mixer module with several options useful for different applications for dynamic signal routing and sound synthesis.
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- Rob Hordijk explains the Dual Fader at the European Electro Music Event 2012, Mallorca, Spain.