Free ShaperBox Alternatives for Sidechain and Rhythm (2026)

ShaperBox 3 by Cableguys costs 99 euros, and for a lot of dance producers it's the plugin that does the pumping, the filtering and the rhythmic chopping in one window.

It's good software. It's also doing something you can do for nothing, once you know which free tools cover which job.

Here's the free route, and the settings to start from.

What Does ShaperBox Actually Do?

It draws a curve, syncs that curve to the beat, and uses it to move something: volume, filter cutoff, pan, width, pitch or time.

That's the whole idea. The value is that every one of those lives behind the same drawable shape, so you can make a bass duck under a kick, then chop a pad into sixteenths, without leaving the plugin.

Free tools do the same jobs. They just don't do them in one place.

TAL-Filter-2

Free, and the closest thing to ShaperBox's core.

It gives you a drawable spline curve, host sync with straight and dotted timings, and lets that curve modulate volume, pan or filter cutoff. Single click adds a point, double click removes it. It runs on Windows, Mac and Linux in VST, VST3, AU and AAX.

Good for: sidechain pumping, tremolo, trance gates, rhythmic filtering

Falls short: one modulation job at a time, and no time or pitch shaping

Kilohearts Essentials and Snap Heap

Free, and a box of small modules: filter, gate, trance gate, delay, distortion, chorus and more. Snap Heap hosts them in chains and lets you modulate anything with envelopes and LFOs.

Good for: building your own multi-effect rhythmic chains

Falls short: no drawable curve, so shapes are simpler than ShaperBox's

Xfer OTT

Free, and not a shaper at all. It's the aggressive multiband compressor that gives modern dance music that dense, bright, "already pumping" feel.

Good for: the loudness and movement half of the ShaperBox sound

Falls short: no rhythm, no sync, and it flattens dynamics if you use it at 100 per cent

Your DAW

Every major DAW can do volume shaping without a plugin: an automation clip on a gain device, a stock compressor with a sidechain input, or a tempo-synced LFO assigned to volume.

Good for: zero extra plugins, and total control

Falls short: slower to set up and harder to copy across tracks

How Do You Build a Free Sidechain Pump?

With TAL-Filter-2 on the channel you want to duck, usually the bass or the pads:

1. Set the modulation type to Volume.

2. Set the sync to 1/4 so one cycle lands on every kick.

3. Drag the first point to the bottom, so the beat starts silent.

4. Add a point about 70 per cent of the way through the beat, at the top.

5. Curve the line between them so the volume comes back gradually rather than in a straight ramp.

6. Set the mix to 100 per cent and press the trigger button so the shape starts with the bar.

If you haven't installed the basics yet, our round-up of the best free VST plugins covers what else belongs on a new machine.

Two refinements worth knowing. Pump the bass harder than the pads, because the ear forgives movement in the low end and notices it in chords. And if the whole mix breathes too much, put the shaper on a bus with only the parts that clash with the kick, rather than across everything. Our low end mixing guide explains why the kick and bass need to take turns at all.