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How To Run Reason With Modular Synths

Propellerhead Reason Tips & Techniques
By Simon Sherbourne

Screen 1: The Silent Way device converts MIDI and CV from Reason into modular–compatible pitch CV that you can patch via audio connections.Screen 1: The Silent Way device converts MIDI and CV from Reason into modular–compatible pitch CV that you can patch via audio connections.

We show you how to get Reason and your hardware or software modular synths speaking the same language.

Last time we looked at how to connect modulation and audio sources between Reason and software modular synths. As promised, this time we'll learn how to generate note CV signals from the Rack so that you can play and sequence modular synths (soft or hard) directly from Reason.


The main story of last month's episode was that what Reason calls CV in its Rack is not the same thing as CV in your hardware modular or virtual Eurorack plug-ins. To use Reason's CV to modulate a modular synth, you have to convert it to an audio signal. We did this using Thor's routing matrix, and Robotic Bean's CV‑O Rack Extension.

If you followed along at home you may have taken the next step and tried to sequence the pitch of a modular oscillator, perhaps connecting something like the Matrix step sequencer to a software modular. If so you'll have encountered a problem: the 'voltage' from the Reason CV is not calibrated in the same way as modular note CV. You'll hear the pitch change, but it won't track correctly. What's needed here is a way to convert precisely from Reason's note CV to a voltage signal that follows a standard modular pitch convention. For Eurorack this is 1V/octave. There is a way... a Silent Way.

The Silent Way Voice...

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Published August 2019