Equation Composer

Documentation and Examples

Inputs and Outputs

There are 7 CV inputs on the Equation Composer: PRG, SR, MOD, [1], [2], [2], and GATE. For each CV input (except for RESET), there’s a corresponding knob. When there are no cables plugged in, the knobs control the values. When a cable is inserted into an input, then the corresponding knob becomes an attenuator for that input.

All of the CV inputs respond to voltages between 0 and +5 volts.

Because the Equation Composer can be re-programmed, it’s possible for the inputs to control almost any aspect of a program. (See the section titled “Factory Programs” for specifics on the inputs.) However some conventions have been adopted to make the module intuitive to use:

  • PRG: Selects the active program.
  • SR: Selects the “Sample Rate”. This is analogous to controlling the frequency or pitch.
  • MOD: Short for “Modification”, typically selects sounds within a program.
  • [1], [2], [3]: Parameters that affect the sound.
  • GATE: Triggers or resets the playback of a sound.

The output is available via the jack labeled OUT.

By default, the Equation Composer is AC coupled, meaning that the output is optimized for audio and ranges from X to -X volts. For advanced users, DC coupled output can be achieved by attaching a jumper on the rear of the unit. *** (TODO: complete this)

The USB jack is used to upload new firmware to the Equation Composer. It does not need to be connected during normal usage.