Intellijel Duatt 1U Dual Attenuverter Mixer

The Intellijel Duatt 1U is a two-channel utility module for Intellijel-format 1U rows, such as the ones in Intellijel's 4U and 7U Eurorack cases, skiffs and Palette cases. It covers attenuation, inversion, attenuversion, mixing and DC offset generation in 14 HP. It is the half-size sibling of the Quadratt 1U and adds a gain doubling switch.

• Two active attenuverters: both channels are buffered, and each has a knob and a polarity switch.
• UNI and -/+ modes: UNI turns the knob into a linear attenuator from 0 V to full level. In -/+ mode it runs from the inverted input through 0 V at noon to the full input.
• Built-in +5V source: both inputs are normalled to +5V, so an unpatched channel gives a manual offset of 0 to +5 V or -5 to +5 V.
• Ax2 switch: doubles the voltage at Channel A. With nothing patched, Channel A gives a full ±10 V offset.
• Summing output: while OUT A is unpatched, Channel A is mixed into OUT B.

In practice the Duatt handles small patching jobs that would otherwise take up 3U space. You can scale an LFO before it reaches a resonance input that has no attenuator, or invert an envelope. You can also narrow a random sample-and-hold voltage and shift it down into a bass register using the offset from Channel A. Because the outputs sum, the module also works as a compact two-input mixer, for example to combine a pulsing LFO and a slow sweep at one destination. It mixes audio as well, such as two oscillators. The Ax2 switch is useful when a modulation source needs more depth for a moment.