The pluripotent surround filter

Stemcell is boring. It's one of those things that nobody really wants, but everybody really needs.
It's a multichannel stem filter with an independent LPF and HPF for each channel in a surround stem.

It has 2 main uses:

1. As a cleanup filter for your stem bus, right before you record.
It'll save you headroom on the main channels and filter the LFE at the same time.

2. As a bass management tool for your speaker outputs.
You can use the redirect buttons to take low frequencies out of the mains, and send it to the LFE.


Sound FX editors are a grubby bunch.

Their pitch shifting, sub-thumping tricks can often lead to a lot of very low frequencies, or very high whines in places it doesn't belong. Don't trust them - they'll devour all the headroom on your center channel the moment your back is turned.

Thankfully, Stemcell has your back.

You can use it to mop up any lingering DC offset or sub-harmonics caused by those meddlesome sound designers. If you feel the need, gently roll off the super high end or get even more drastic with that foley stem.

You can even deal to your LFE filtering right there in the same plugin, with it's own top and bottom filters, independent of the rest.

If you're monitoring on smaller speakers, or want to replicate the bass management of the new immersive formats, use the redirect buttons to send the filtered bass signal off to the sub. You can even choose different frequencies for individual speakers.

It's even possible to quickly audition the removed signal across the whole stem by switching in the listen button.

Stemcell - clean up your act.

Current version: 1.0.x
Mac OS 10.8 or greater
Windows 10 (others untested)
AAX Native and DSP
Pro Tools 11 or greater


  The Cargo Cult. is a boutique audio software design company based in Wellington, New Zealand, developing and distributing the products and designs of Justin Webster.
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