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Connectivity

Note: this image's orientation makes a lot more sense looking down from the top of the unit, but we wanted to capture the visual of the back panel accurately.

Outputs

Mono or stereo output on 3.5mm cables, split between three modes, depending on how you're connected:

  • Mono mix ( right ): if only one cable is connected to the right output, then the stereo signal is mixed down to mono and sent across that one cable. This is marked as mono on the top panel.
  • Dual mono ( left & right ): if two cables are connected to the left and right outputs, then the stereo signal is split across the cables.
  • Headphones / stereo TRS ( left ): if only one cable is connected to the left output, then the stereo signal is sent across that one cable. This is marked as phones on the top panel.

CV Inputs

Three control voltage inputs on 3.5mm cables. Designed with Eurorack systems in mind, but will work with any traditional CV source.

  • Each input ( a b c ) responds to a +/-5V range.
  • Voltages up to +/-12V are safe to connect, but there will be no further response beyond +/-5V.
  • Signals received over these inputs can be mapped to any parameter, just like the internal modulators.

The ports are indicated by arrows on the top panel with the letters a, b, c within.

When CV cables are connected, you'll see the corresponding light shine above the cv key.

MIDI

Two MIDI connections on 3.5mm cables:

  • MIDI out, type A
  • MIDI in, automatically accepts both type A and B

The ports are indicated on the top panel by arrows pointing down (in) and up (out). To connect to classic DIN MIDI jacks, you'll need an adaptor.

Remote

Two USB connections for different layers of inter-connectivity:

  • computer: This USB-C port is used for MIDI and serial communication back to a host device, eg. a DAW running on your computer. Atrium will enumerate as a standard MIDI device when connected to a host through this port. Indicated by a laptop icon on the top panel.

If you're powering Atrium from a computer's USB port via power, these computer signals will also be sent on that cable. In this case, leave the computer port unconnected, as attaching it steals priority from the power port.

  • controller: This USB-A port is used to host MIDI or serial devices, eg. traditional MIDI keyboards, MIDI CC knob boxes, and (soon) monome grids. It provides up to 900mA power. Indicated by a one octave keyboard icon on the top panel.

The light above this port will shine when a USB device is connected & powered up.

Power

One USB-C port for power & data (MIDI and serial).

  • We recommend a supply capable of delivering 5V @ 3A. The optional power supplies provided by Whimsical Raps meet these specs.
  • When connected to a host computer, this port can carry both power and data, meaning that you can power Atrium while its connected to your DAW & other software. In this case, do not connect anything to the computer port.

When powered on, the light window above the port will shine. The left light indicates power, while the right light indicates that this cable sees a USB connection to a host computer.