Molla

Name: Molla
Author: HoRNet

by HoRNet · Reverb · Physically modeled spring reverb

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Molla is a free physically modeled spring reverb from HoRNet, with one spring model and an animated spring that reacts to the input.

Controls cover reverb length, density and dry/wet mix.

Best for: Guitars, Vocals, Drums, Keys & Synths. Genres: Rock & Indie, Lo-Fi, R&B & Soul.

Keywords: spring, physical modelling, free, lo-fi, drums, vocals, CPU-light, dub, electric guitar, metallic, minimal controls, smooth, cathedral, harsh, mixing, resizable UI, retro, subtle, vintage.

What it does

Molla (Italian for "spring") is HoRNet's free physically modeled spring reverb. It takes the algorithms of HoRNet's SpringVerb and cuts them down to a few controls, aiming for "a unique and vintage reverb character" with low CPU use.

Physical model: simulates the behavior of a single spring rather than using a convolution impulse.
Reverb Time: sets the decay, from short, subtle splashes to long, cavernous tails.
Density: at 100% the decay is smooth and natural; turned down towards 0% it gets metallic, brittle and lo-fi.
Dry/Wet: blends the dry signal with the reverb, so it works on an insert as well as a send.
Interface: resizable and hardware-accelerated, with a spring animation that moves with the audio.

It is free.

Source: HoRNet product page

When to use it

Molla is the pick when you want a quick, free spring sound with almost no setup. Compared with Arturia Rev SPRING-636 it has one spring and three knobs, with no tone controls or tank choices, but it costs nothing and is light on CPU. HoRNet's own SpringVerb uses the same algorithms with more controls, so it is the step up if Molla feels too limited. Valhalla VintageVerb and Pro-R 2 sound more polished but have no dedicated spring model, so Molla is the better fit for the boingy, drippy character of an amp tank.

Best for: guitar amp-style reverb, surf and retro vocals, splashy drums and dub effects.
Genres: rock, surf, dub, soul and lo-fi.
Look elsewhere if: you want several spring tanks or tone shaping (Rev SPRING-636 or HoRNet SpringVerb), or a clean studio reverb (VintageVerb, Pro-R 2).
Tip: lower Density for a metallic, broken lo-fi tail, or keep it at 100% for a smoother decay.

Where to buy

HoRNet: Free
Plugin Boutique: Free

Tutorials and reviews

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