Harmony Bloom
10 Underrated VST Plugins Every Producer Should Know About
Looking for some new underrated VST plugins that aren’t as popular but super effective in music production? We’ve highlighted 10 hidden gems that deserve a spot in your DAW.
We all know the heavyweights—Serum, Diva, FabFilter, Oeksound’s Soothe. They’re brilliant, yes, but also ubiquitous. The problem? When every producer is working with the same set of tools, standing out becomes harder. That’s why digging a little deeper into the plugin world can open up new creative doors.
In this article, we’ve rounded up 10 criminally underrated VST plugins that punch far above their weight. These aren’t your typical chart-toppers—but they should be. The list has everything from synth plugins, experimental sound manglers, clever sequencing tools, or simply some fresh FX. We’ve also included a few high-quality free underrated VST plugins—because great sound shouldn’t always come with a premium price tag.
If you’re looking to give your productions a unique edge and explore tools not yet overused by the masses, these hidden gems might just become your new favorites.
10 Criminally Underrated VST Plugins of 2025
- 510k Seqund
- Harmony Bloom
- Slate + Ash – Cycles
- Minimal Audio Current
- Psychic Modulation VectoMelt2
- Freakshow Backmask
- Sonic Charge Bitspeek
- Ruina Noise Engineering
- Rip Chord
- Max for Live devices
510k Seqund – A Versatile and Underrated Sequencer Plugin for Polyrhythms
Seqund is personally one of my favorite plugins and is part of almost every project I work on. It’s basically a sequencer that not only gives you great control but also sparks ideas and lets you do complex things like polyrhythms with ease. Starting with the user interface—it’s simple and intuitive. You don’t need to go through hundreds of pages of a manual to figure out how it works. Different parameters are color-coded to make it easier to see what’s going on, and all the functions are laid out on the main page, so you don’t have to shuffle through tabs to tweak anything.
If you’ve ever worked with drum machines or hardware synthesizers, this plugin will feel like bread and butter. The “Gate” works similarly to the gate functions found in many Eurorack modules—it determines when a note is triggered. By default, you get a 16th-note sequencer and can select which steps you want to activate. You also get options for note length, chance (probability), hold, and ratchet functions. The Hold lets you sustain a particular note, while Chance allows you to set a probability percentage for each active note. You can even shorten the pattern length from 16 to something like 12 steps, making polyrhythms incredibly easy to create.
Below these, there’s a Pitch section that lets you work in chromatic or any other scale, which you can set at the bottom of the plugin. Every feature includes a Randomize button, so if you’re just exploring or looking for inspiration, you can keep hitting the dice icon until something clicks. You also have the ability to modify Octave, Transpose, Velocity, and more—just like you can with the gates and pitch. One thing to note: Seqund only supports monophonic sequences, so you can’t create chords with it.
That said, for basslines and drums, 510k Seqund is probably one of the most versatile and underrated sequencer plugins out there.
Key Features:
- Two melodic lanes + one probability lane for alternating between melodies.
- Independent lane lengths for easy creation of complex polyrhythms.
- Ratchet, Hold, Chance, Length, Octave, Transpose, and 3 MIDI CC# lanes for deep modulation and groove control.
- Real-time pattern switching: Up to 12 user patterns per preset, triggered via MIDI notes.
Price: €59,00 EUR
Harmony Bloom – A Unique MIDI Sequencer for Complex Patterns
Harmony Bloom is also a sequencer, but it stands out due to its unique operation and use cases. The interface definitely deserves an award—it’s easily one of the best I’ve seen in a VST plugin. When it comes to creating sequences, the approach is quite different. Instead of a traditional linear sequencer, Harmony Bloom uses a circular layout with eight dots. When you play a key, it triggers notes, and as the inner dot rotates, it triggers any active outer dots or lines it crosses.
In terms of features, you can start by selecting the root note and scale. You can also modify the loop length, which controls the speed of the rotating radius. The Quantize Offset sets the spacing between triggered notes. By adjusting it, you can form different geometric shapes—like pentagons, hexagons, and more—which directly affect the rhythm and feel of the pattern. The Free Offset allows you to further control note spacing, adding even more variation to your sequences. Additional features include Probability, Tempo Sync, Random Velocity, Trigger Bars, Speed Offset, and more.
While there is a learning curve and the plugin can get complex at times, the kind of patterns you can create with it are unlike anything I’ve seen. I honestly can’t think of another MIDI generator that offers this level of creative control.
Key Features:
- Supports polyrhythmic MIDI sequencing with a visual circular interface.
- Includes 57 scales and 57 curated note collections.
- Offers probability-based pattern generation and randomization options.
- Allows MIDI Learn and MIDI CC mapping for custom control.
- Trigger bars support independent MIDI channels and octave settings.
Price: $29
Slate + Ash – Cycles – A Loop Manipulation and Granular Synthesis Kontakt Instrument
Cycles is a loop manipulation and granular synthesis instrument built for Kontakt. In a time when using loops has become a common production technique, tools like Cycles can transform familiar sounds into something entirely new and interesting. The plugin works by chopping up input signals into small grains, then sequencing them to create evolving, textured loops. The interface isn’t the most intuitive at first, and it may take some time to understand what’s going on. However, once you’ve spent time exploring it, you’ll realize just how powerful it can be.
By default, the loaded sound is mapped to the C3 key on your MIDI keyboard, though this can be changed by clicking on it. Cycles offers two main modes: Loops and Grains. Hovering over the “L” or “G” at the top right and clicking the “+” icon will open the available sound sources. You can browse through categories like Basic, Ambient, Textural, Rhythmic, and Gestural to get a better sense of what Cycles is capable of. The sounds are notably crisp and have a polished, analog-style character.
In Grains mode, Cycles operates at a micro-level, slicing each loop into tiny fragments and reassembling them into new textures. The XY section divides the sound into four interactive pads—Grains, Window, Color, and Space—which you can control in real time. You can link parameters, record mouse movements, or use LFOs for modulation. The sequencer arranges patterns on a two-dimensional grid, allowing for complex, non-linear rhythms.
Cycles also includes built-in effects such as Reverb, Space, Formants, and Delay. You can connect an external MIDI device to control all parameters by hand. One of its most powerful features is the ability to import your own samples—just drag and drop up to 25 files onto the interface and use the loop and grain engines to reshape them creatively. The library comes with over 494 loop sources, 100 preset states, and 189 preset patches, all packed into a 2.8GB file.
Key Features:
- Granular Synthesis and Loop Manipulation: Combines granular synthesis with step-based sequencing for dynamic sound creation.
- 189 Presets and 494 Loop Sources
- User-Sample Loading: Allows you to import your own samples for further manipulation and customization.
- Advanced Modulation and Real-Time Control: Includes XY pads, LFO modulation, and easy integration with hardware MIDI controllers for live performance.
Price: £199.00
Minimal Audio Current 2.0 – An Underrated Synth Plugin for Unique Sound Design
Minimal Audio faced significant backlash when they initially launched their synth with a subscription model, leading to complaints about affordability. In response, they made the synth available for a perpetual license, priced at $199, aligning it with competitors like PhasePlant, Serum, and Diva. While the price is competitive, Current 2.0 proves to be as powerful as any of these popular synths.
What we really appreciate about this plugin is its simple layout, which isn’t intimidating, yet still offers in-depth workflow options. One of the standout features of Current 2.0 is its unique design, which addresses a common issue for modern music producers: how to make presets sound personal and different from others using the same patch. The plugin includes a Play section with an XY scratch pad and macro controls, allowing you to quickly tweak settings and make sounds your own. While many synth plugins offer macro controls, this is essentially an advanced yet user-friendly version.
For those who prefer to create from scratch, there’s Engine mode, which combines five parallel sound engines, extensive modulation options, expressive MIDI effects, FM synthesis, and advanced filtering. The plugin includes two spectral wavetable oscillators, an additive sub-engine, a granular synthesizer, and a time-stretching sampler.
The advanced audio effects rack in Current 2.0 is one of the best we’ve seen, even compared to other synths like PhasePlant and Diva. Unlike standard effects found in many plugins, which are often used for mixing, this effect rack is specifically designed for sound design. While synths like Serum, PhasePlant, and Diva offer typical effects that you can find elsewhere—often in line with stock plugins—Current 2.0’s effects are more unique and tailored for creating innovative sounds. When combined with its modulation system, the plugin enables the creation of complex, distinctive sounds quickly.
Additionally, the plugin is cloud-connected to a sound platform, providing a steady stream of presets, samples, and wavetables.
- Five Parallel Sound Engines: Includes spectral wavetable oscillators, additive sub-engine, granular synth, and time-stretching sampler for diverse sound creation.
- Advanced Audio Effects Rack: Freely load Minimal Audio’s effect plugins for endless sound design possibilities and polished mixing tools.
- Flexible Modulation System: Offers quick modulation assignment, mod matrix for advanced control, and easy modulator swapping.
- Stream Integration: Cloud-connected platform for discovering new presets, samples, and wavetables that automatically sync with your work.
- Expressive XY Control: Dual XY pad for intuitive manipulation of key parameters, designed for both beginners and advanced users.
Price: $199
Psychic Modulation VectoMelt2 – A Multi-Effect Plugin for Vintage Sound Manipulation
If you have a fondness for nostalgic-sounding effects, VectoMelt 2 is a great plugin to consider. You may be familiar with the popular RC-20 by XLN Audio, and while VectoMelt 2 is a fantastic alternative, it differs primarily in the distortion section. It’s a multi-effect modulation plugin that’s perfect for effects like Chorus, Echo, Flanger, and Lo-fi. One standout feature is the scratch pad, which lets you play around with the speed and depth of the effects. For synths, this works like magic.
The user interface reflects the vintage style of effects it applies to the input signal. On the left side of the plugin, there’s a Wow and Flutter effect fader with randomization options. You also have controls for Pitch, Amp, Echo, and Spread Modulation, all laid out alongside the Matrix. Automod is essentially an LFO modulation for the effects, with a speed dial for further control. You can fine-tune settings in the Chorus, Phltr, and Echo sections.
At the lower right of the plugin, there’s a Lo-Fi knob that adds a bit-crushed texture, giving your sounds a unique low-bit character. The tonality is fantastic and adds a distinct, lo-fi feel to your tracks. It’s easy to use, sounds great, and is available at an affordable price point.
- XY Modulation Vector: Controls pitch, amp, phltr, and echo with analog-style drifting using the X axis for instability and the Y axis for modulation depth.
- AutoMod: Modulates the XY pad with Orbit (circles the XY point) and Jump (sporadically jumps out of orbit).
- Multi-FX: Includes Chorus (multi-voice stereo spread), Phltr (phaser-like filter), Echo (dub-style delay), and Lo-Fi (band-splitting saturation).
- Sub Presets & Randomization: Individual FX sections have sub-presets and randomization options for unique sounds.
- Customizable GUI & Patch Management: Scalable interface and intuitive patch management with several presets to begin with.
Price: $64.00
Freakshow Backmask – A Quirky Yet Underrated Plugin for Creating Reverse Effects
Freakshow Industries is known for creating some truly unconventional plugins that somehow sound amazing. The one we’re talking about here is Backmask, a chaotic reverser plugin. The user interface is just as quirky and amusing as their website. Despite the strange design, the plugin is very easy to use and can be incredibly helpful.
What it allows you to do is divide the input signal into segments and then gives you the option to reverse them. By default, when you open the plugin, the labels on the parameters may seem confusing, as they’ve been deliberately set up in a chaotic way. However, once you click the Info button on the lower right, everything becomes much clearer.
After selecting the size of each segment, you can trigger the reverse effect by milliseconds, note value, or levels. You also have the option to reverse everything, alternate the reversals, or randomize them. This makes it a great tool for creating drum reverses, or for adding reverse effects to pads or any other sound where you’d typically use a reverse effect.
Key Features:
Periodic Reversing Effect: Allows for control over the frequency and size of reversed segments.
Tempo Sync: Option to sync the reversal effect with the tempo.
Price: $20.
Sonic Charge Bitspeek – A Unique VST Plugin for Bit-Crushed Vocoder Effects
Bitspeek is a plugin with a very specific use case and might not be suitable for every track. It’s primarily an effect plugin that modulates the input signal in real-time, creating a unique bit-crushed effect. Sonic Charge describes it as a “pitch-excited linear prediction codec effect.” Linear prediction coding is a voice compression technology that emerged in commercial products in the 1970s and was later used in some well-known speaking toys from the early 1980s. The plugin is almost 15 years old but still quite relevant for modern sound design methods.
The user interface is clean and well-organized, providing easy access to the controls. You can modify the sample rate (ranging from 8–44 kHz), adjust the frame rate, or sync it to tempo. Additionally, you can control pitch and envelope via MIDI. Below the faders, there are five knobs for Pitch, Tracking, Detune, Noise, and Mix.
Overall, Bitspeek is quite easy to use and delivers excellent audio processing. There are no strict rules for where to use it—you can experiment with it on drums, guitars, or any other sound to achieve unique results.
Key features:
- Linear Predictive Coding (LPC): Uses LPC to resynthesize speech and create unique voice effects.
- Four Main Controls: Adjust pitch, tracking, detune, and noise for customizable sound manipulation.
- Flexible Frame Rate: Control sampling rate from lo-fi 8kHz to 44.1kHz with rhythmic beat syncing.
- MIDI Control: Allows pitch control via MIDI input for robotic and vocoder-like effects.
- User-Friendly Interface: Simple design, no presets, ideal for quick voice manipulation and sound design.
Price: $33.00
Ruina Noise Engineering – A Free VST Plugin for Distortion and Texture
Ruina is a free plugin by Noise Engineering based on the Eurorack module. The user interface is fairly simple, with limited control options. All the effects are controlled through faders, including Blend, Overdrive, Phase, Fold, Center, Saturate, Octavize, Doom, Buzz, and Filter Level.
It is a stereo distortion plugin built on digital algorithms, meaning it doesn’t aim to replicate old hardware but instead offers its own unique character. The plugin provides a wide range of distortion styles, from soft, warm saturation to full-on, heavy destruction.
One of the best aspects of Ruina is its flexibility. It works equally well for adding a bit of grit to vocals as it does for completely mangling a synth or pushing drums to the edge. It’s perfect for experimentation and discovering unexpected textures, regardless of the sound you’re working with.
Overall, it’s a great, handy free plugin for distortion, and probably one of the most underrated free VST plugins available.
Price: Free
Ripchord – A Free Plugin for Effortless Chord Progressions
Ripchord is a free MIDI plugin that simplifies the process of building chord progressions. Instead of playing full chords yourself, you can trigger a whole chord by pressing just a single key. This is especially useful if you’re not a trained pianist or if you just want to speed up your workflow.
You can create your own chord presets from scratch, load up expansion packs, or even drag in a MIDI file with chords, and Ripchord will automatically turn it into a preset. It’s highly flexible, and once you get the hang of it, it’s a great tool for experimenting with different harmonic ideas.
There are two modes: play and edit. Most of the time, you’ll likely be in play mode, where you can trigger chords using a MIDI keyboard or simply by clicking around with your mouse. In edit mode, you can build or tweak presets by clicking an input key to assign a chord to it. If you have a MIDI keyboard connected, you can preview everything as you go.
One thing to remember is that Ripchord won’t do anything until a preset is loaded. Presets are the core of how it functions, and once you have a few saved, it becomes a powerful tool for quickly sketching out progressions or trying out new ideas.
Price: Free
Max for Live Devices for Ableton Live
The last one is for Ableton users only. Max for Live is quite a great concept by Ableton allowing anyone to make Ableton-compatible utility devices. There are tons of amazing Max for Live devices that can spark creativity, provide complex modulation features or even effects. We have listed down some of the best max for live devices for Ableton.
- Granulator III – Robert Henke’s granular synthesizer has been updated for Live 12, featuring an improved user interface and several new capabilities. Among the additions are two new granular playback modes, expanding the instrument’s sound design possibilities. The update also introduces support for MPE (MIDI Polyphonic Expression), allowing modulation of grain parameters such as size, shape, and position for more expressive and dynamic control.
- Slink Filter – Slink Filter is a filter bank consisting of 32 bandpass filters, with their amplitude modulated by a custom wave engine known as the Slink wave. It can be used to apply subtle, analog-style modulation to a sound’s frequency content or to create more complex and evolving spectral effects
- MDD SnAkE 3.2.3 (Free) – A MIDI generator inspired by modular machines. The unique pattern-creation method can yield some really interesting and unique results.
- STING by IFTAH (Free) – A simple yet effective acid line generator. Can create ready-to-use bassline patterns in seconds.
Also Read:
