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The Sn by DecadeBridge is a compact lo-fi FM synthesizer capable of producing a surprisingly broad range of sounds. With seven FM algorithms, each offering three distinct pitch settings, it’s an excellent tool for anyone interested in exploring unconventional soundscapes. While it fits into the Eurorack world, its design and flexibility make it feel more like a pedal at heart, inviting creative experimentation beyond traditional rack setups.
Algorithm and CV Control
The algorithm selection on the Sn can be stepped through using a trigger or gate signal, allowing for dynamic shifts in sound without manual intervention. Meanwhile, the carrier and modulator pitch control, along with the FM amount, provide further opportunities for sonic manipulation through CV input. The result is a highly flexible instrument capable of reacting to external signals in ways that open up creative possibilities.
Additionally, the output is run through a 3-position passive low-pass filter, which transforms into a low-pass gate when the VCA switch is engaged. This combination allows the Sn to move effortlessly between subtle and intense sonic landscapes.
Drones and Ambiance
One of the standout features of the Sn is its ability to generate rich, immersive drones. Despite its compact size, the depth of ambiance and unique textures it can create is astounding, limited only by the user’s imagination.
Its simplicity makes it a joy to use, offering an intuitive interaction that becomes even more exciting when paired with external effects. Though small in scope, the Sn continuously delivers sonic surprises that keep the creative process fresh and engaging.
Percussion and Noise
The low-pass gate on the Sn makes it particularly effective for crafting percussive sounds, enhancing its versatility. Combined with its capability for noise-driven music, the Sn proves to be a valuable tool for artists looking to incorporate rhythmic components or add gritty, textured layers to their work.
Sn excels in genres where subtle (or not), evolving textures are key, opening up new creative avenues for sound design and production. The Sn also surprises when paired with a patch programmer, such as the Traffic by Jasmine and Olive Trees or the PV44 by XODES, which can modulate the various CV inputs consecutively, transforming this little synthesizer into a multi-voiced powerhouse.
Pitch Tracking
While the Sn thrives in experimental and ambient soundscapes, it is also fully capable of handling more traditional melodies. FM synthesis often invites a sense of chaos initially, but with the right approach, it can be effectively tamed for various applications.
With the pitch “all” switch down, the carrier and modulator become interestingly connected. This allows the Sn to produce in-tune melodies that track volt-per-octave over a 5-volt range. This versatility makes the Sn adaptable enough to accommodate harmonic compositions when desired.
You can refer to the following Patch Note to understand the logic behind taming FM for musical purposes. If you find it challenging to tame FM synthesis for musical purposes, we offer numerous Patch Notes on our Patreon to assist you.
Let’s delve a bit deeper into the link switch. When the link switch is in the down position, it sets the modulator pitch as a ratio to the carrier pitch. In the middle position, the modulator pitch is added to the carrier pitch, allowing both settings to move together when CV is sent to the carrier input. For both the down and middle positions, one recommend turning the carrier pitch up so you can hear it clearly.
Crank up the FM amount and tweak the modulator to find an interesting sound. Once that tone is dialed in, just turn the carrier pitch down a bit, and it should still have a nice, natural vibe, with the carrier controlling both pitches. If it gets a little noisy at higher notes, a slight reduction in the FM amount usually does the trick. And when the switch is in the input position, the modulator and carrier pitches do their own thing, so the modulator won’t follow the carrier pitch.
Mounting Limitations—Eurorack Pedal Synth?
One potential downside of the Sn is that it cannot be screwed directly into a Eurorack case. For those who prefer a fully integrated setup, this might be a minor inconvenience. However, if you enjoy working with external devices, this can actually be a positive. See it as something reminiscent of a pedal but made for Eurorack—offering flexibility in how and where you use it within your setup. This unique aspect can open up creative possibilities in how you position and interact with the module.
Size and Price Point
The Sn’s size is only comparable to its price point: both are impressively small. Despite its compact form, this module delivers an enormous range of sound design capabilities, making it an incredible value. For such a low price, the sheer power and versatility packed into the Sn is astonishing, allowing artists on a budget to access a tool capable of producing expansive, high-quality soundscapes without breaking the bank.
In Sum
Ultimately, the Sn is wild and unpredictable, but with dedication, it can produce some truly remarkable results. It’s an instrument for those who love to explore the edges of sound design, and its unpredictable nature only adds to the fun. For anyone willing to tame the little beast, the Sn by DecadeBridge — what could be called a Eurorack pedal synth — offers endless creative potential.
Here's a great video to hear it in action.
This product was sent to me by DecadeBridge out of pure generosity. It is therefore out of pure pleasure that I wrote this article.
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