Foundations Filter Sweep

A warm, evolving pad sound built entirely from Cascadia's normalled signal path -- zero cables required. Envelope B sweeps the VCF cutoff on each note, creating a gradual brightening that decays into a dark, filtered tone. The wave folder adds a touch of harmonic complexity on top, giving the sweep a subtle metallic shimmer that a standard subtractive patch would lack.

This is the sound you created in Session 3 of the Foundations module. It demonstrates how much timbral movement is possible using only Cascadia's built-in connections: an oscillator through a filter swept by an envelope, with wave folding for extra character.

How to Play

Play sustained notes or slow chords in the C3-C5 range. Hold each note long enough to hear the full filter sweep -- the brightness rises over about half a second, then gradually decays. The effect is most pronounced on single notes where you can focus on the timbral movement. Try playing two notes a fifth apart and holding them for a slowly evolving pad texture.

For a more dramatic sweep, raise the VCF FM 1 slider further. For a subtler effect, lower it. The FOLD slider on the Wave Folder controls how much harmonic complexity is layered on top of the filter sweep.

What Makes It Work

The core of this patch is the normalled connection from Envelope B to VCF FM 1. Every time you play a note, MIDI gate triggers Envelope B, which outputs a voltage curve shaped by the RISE and FALL sliders. This voltage sweeps the filter cutoff up and back down, creating the characteristic brightness-then-darkness movement.

The VCF FREQ slider sets the resting cutoff frequency (low, around 9 o'clock), so notes start dark. Envelope B pushes the cutoff higher during its rise stage, then the cutoff falls back as the envelope decays. The VCF Q at 10 o'clock adds a mild resonance bump that emphasizes the sweep frequency as it passes through, making the movement more audible.

The Wave Folder at 10 o'clock adds harmonics to the already-filtered signal. Because the wave folder sits after the VCF in Cascadia's signal chain, it folds a signal that is already spectrally shaped -- this creates a warmer, more controlled folding effect than folding a raw oscillator would produce.

Created In

Session 03: Filter Envelope, Wave Folding, FM & FX