Home | Products | Software | Volta | Control Sources


Click on an item to learn more about it.

Volta - Voltage Control Instrument Plug-in

Control Sources

Volta provides seven types of control sources that perform a variety of different functions.

A single instance of Volta has 24 slots of output in which any combination of control sources can be applied. You can open as many instances of Volta active as your hardware allows.

Volta sources

For example, a MOTU PCI-424 system with four 24I/O audio interfaces provides 96 DC-coupled analog TRS outputs which can serve as CV outputs. You can even mount the rack brackets on the rear panel of each 24I/O interface to mount it facing forward and use it just like a patch bay.


A Volta Voice turns MIDI notes into voltages to control the pitch of your oscillators. A voice has a set of optional functions that appear as additional outputs. Usually, a voice needs an additional signal to gate the output of the oscillator. Volta produces up to four envelopes for controlling VCAs, filters or other modules. If you'd prefer to use hardware envelopes, these can be turned into gates or triggers.

You can also add initial and release velocity and LFO for each Voice.

Polyphony with Volta is easy. Simply drag on as many voices as you need.


The MIDI source receives MIDI controller data and directly transforms it into a control voltage signal. This allows you to use MIDI controllers like aftertouch or your mod wheel. The optional smoothing parameter can be used to smooth out the stair stepping associated with 8-bit MIDI controllers.

MIDI source


The ramp source routes the high resolution automation data from your DAW to control voltages. As soon as you drop the ramp source into a Volta output slot, it publishes as an audio automation data source for the Volta instrument track. Insert or record automation ramp data using all of the powerful automation tools in your host DAW to then control your outboard gear.

Finally, intricate time-line based automation can be used to sculpt your compositions over time.

(Double click movie to begin playing)

Download full-resolution movie (11.5 MB)


Volta's LFOs provide the standard sine, triangle and square wave shapes, but each with adjustable symmetry. You can set the LFO period in real-world units, or sync the LFO to your project tempo.

A single LFO cycle can stretch over 16 bars for delicately evolving compositions. In addition, you have three random voltage generators, including sample and hold, sample and ramp and random walk for all sorts of interesting smoothed and stepped CV functions.

LFO source

Trigger Sequencer

Volta's Trigger Sequencer can be used to fire off envelopes, step external sequencers, reset LFOs — anywhere you'd need a trigger signal. You have up to 32 steps, two modes (forward and pendulum), adjustable trigger duration and swing.

Trigger source

Step Sequencer

The Step Sequencer provides an easy way to generate stepped voltage sequences in sync with your project. Like the Trigger Sequencer, you have the same swing, mode and length options, but the Step Sequencer can be calibrated like the pitch CV outputs and quantize the result to the nearest semitone.

Step source

Clock source


The clock output allows you to clock external sequencers, hardware or drum machines to a user-selectable PPQ. Since you can have multiple clock modules running simultaneously, you can synchronize multiple external devices from a single instance of Volta.