Operator modes explained

Opsix packs five ‘modes’ for its operators, but what do they actually do? Let’s take a look...

01

FM – This is classic DX7-style FM, where the input wave modulates the pitch of the operator. For classic FM tones, stick to sine waves but don’t be afraid to experiment with other shapes. In FM mode, Feedback does what it sounds like – routes an operator’s output back into its own modulation input. This can have a similar effect to wavefolding, making simple waves more complex.

02

FILTER

– Filter mode is like a combined virtual analogue oscillator and filter. The operator’s selected waveshape is blended with any input using Osc Mix, then sent through one of multiple filter modes. Using several Filter operators combined is great for virtual analogue patches. Alternatively, set Osc Mix to focus solely on the input to use the operator purely as an additional filter.

03

FILTER FM – Filter FM uses the same filter models as Filter mode. However, rather than routing the input through the filter, it’s used to apply audio rate modulation to the cutoff point. This can sound similar to standard FM. For something different though, try exploring different filter types and resonance amounts, or use a low-pitched modulator with an abrupt square wave for interesting effects.

04

RING MOD – A similar principle to FM, but rather than using the modulator to control the frequency of the oscillator, ring modulation multiplies the two waves to create rapid modulation of the amplitude. Here the main control of notes is the Shape parameter, which can adjust the amount of overtones added.

05

WAVE FOLDER – Wave folding works by literally folding the top and bottom of a waveform back in on itself when it crosses a certain threshold, creating a more complex wave. Opsix’s Wave Folder can be used in isolation – use Gain to push a wave into wavefolded distortion, and Bias to adjust the tone. Here any input is blended in using the Oscmix control.