Online gear marketplace Reverb.com has released Reverb Solo – a free one-knob reverb plugin, created in partnership with Acon Digital.

Here’s what they have to say about it: “From bright, nearly slap-back echo, to elongated cavernous rumbles, this first partnership between Acon Digital and Reverb.com brings an entirely new ambience to your tracks.”

With just one knob, you can dial in short, bright reverb for a small room, up-front vibe, or long, dark reverb that places your mix in deep space.

Here’s the official intro video:

It’s available now as a free download, for both Mac OS X & Windows.