Autofilter

Autofilter Device

Essentials

Autofilter is a dynamic filter driven by an envelope follower or sidechain input. It opens/closes a low-pass or high-pass filter based on input level, creating rhythmic movement and ducking effects automatically. Perfect for adding movement to pads, creating sidechain pumping, or rhythmic filtering.

  • Envelope follower or sidechain input

  • Low-pass and high-pass filter modes

  • Automatic rhythmic movement

  • Sidechain triggering for creative effects

  • Great for pads, bass, and rhythmic filtering

Envelope

AutoFilter Envelope

Threshold

Input level at which the envelope follower starts responding (0-100%, equivalent to -∞ to 0 dB)

Attack

How quickly the follower responds to rising levels (1-2000 ms)

Sustain

Holds the envelope to sustain modulation (1-2000 ms)

Release

How quickly it returns after the signal falls (1-2000 ms)

Sidechain

Optional external input for sidechain triggering. If connected, uses sidechain signal to determine filter movement instead of main input.

Filter

AutoFilter Filter

Mode

Filter mode:

  • Low Pass: standard lowpass filter

  • Low Pass Inverted: inverted lowpass filter

  • High Pass: standard highpass filter

  • High Pass Inverted: inverted highpass filter

Cutoff

Frequency where filtering begins (18-10000 Hz). In inverted mode: when filter is triggered. In normal mode: when filter is not triggered.

Resonance (Q)

Emphasis around the cutoff frequency (0.01 to √2). Higher values create more pronounced resonance peaks.

Depth

Envelope modulation amount for cutoff (-100% to +100%). In inverted mode: how far away the cutoff is when not triggered. In normal mode: how far away the cutoff is when triggered.

Output

AutoFilter Output

Gain

Output level after filtering (-inf to +9 dB equivalent)

Mix

Blend between dry and filtered signals (0-100%). 0 = 100% dry, 100% = 100% wet.

On/Off

Activates or bypasses the effect

Practical Tips

Practical Tips

  • Rhythmic movement: Add rhythmic filter motion to basses, leads, or drums.

  • Transient emphasis: Emphasize transients or create swell effects.

  • Dynamic carving: Carve space dynamically in a busy mix.

  • Bass/synth motion: Add subtle or dramatic movement.

  • Sidechain pump: Feed drums to sidechain for rhythmic pumping.

  • Close mode: Use for ducking or reverse-motion effects.

  • Resonance + depth: Combine for sharper, expressive peaks.