The design could be described as semi-modular, in that the oscillator and filter sections are open slots that allow the user to select between various different oscillator and filter types, each with a distinct character. Some of these designs were inspired by selected vintage equipment.
In the extensive Modulation bus routing section both audio and control signals (CV) co-exist, and more or less any routing combination can be assigned. Use audio to modulate a CV signal or vice versa - Thor’s modulation capabilities are virtually limitless.
There are also audio inputs on the back panel. By connecting the output of another device to these inputs, you can use Thor’s filters, envelopes etc. to process the sound, or you can use the external audio source to modulate a Thor parameter.
This chapter assumes familiarity with common synth terminology like oscillators, waveforms, filters and envelopes. If you are new to Reason (or these terms), you may want to read the
“Subtractor Synthesizer” chapter first, where these elements and how they interact are described from a more basic point of view.