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Build: Filtered Oscillator

An oscillator routed through a filter and then a gain stage. This is the classic subtractive synthesis signal chain: generate a harmonically rich waveform, then sculpt it with a filter. The amp at the end controls output level.

Step 1: Add an oscillator

Section titled “Step 1: Add an oscillator”

Start with an osc node set to sawtooth — it is harmonically rich and responds well to filtering.

Nodes added: fo-osc

Step 2: Add a filter

Section titled “Step 2: Add a filter”

A lowpass filter removes frequencies above the cutoff point, taming the brightness of the sawtooth.

Nodes added: fo-flt

Connections: 1 new

Step 3: Add a gain stage

Section titled “Step 3: Add a gain stage”

The amp node at the end controls the overall output level of the filtered signal.

Nodes added: fo-amp

Connections: 1 new

Step 4: Group into a module

Section titled “Step 4: Group into a module”

Select all three nodes and press g. Expose audio-out, and the oscillator, filter, and amp parameters.

What you just built

Section titled “What you just built”

A reusable Filtered Oscillator module with 5 exposed parameters and 1 exposed port.

Select it in the Module Library (SPC m) to add one to any patch.

Next steps

Section titled “Next steps”