Swell

At a glance

Swell is a 14-HP valve harmonic filter at the crossroads of East and West: a precision analogue filter shaped by a Cold War-era military valve that sculpts timbre into new territories.

1. A Soviet military-spec subminiature valve, actively in the signal path

2. Precision 24dB/oct 4-pole analogue filter — musical, temperature-stable, and detailed

3. Full control over where and how the valve shapes your sound: mode, bias, gain, and placement

4. Split personality: from compressed warmth to untamed chaos — provoked by FM feedback or sheer resonance.

5. Self-oscillating VCO with 1V/Oct tracking — use the valve to sculpt the waveform itself

Want to know more?

Get started with the Swell Quick Guide.

For more details have a look at the product documentation here

Worldwide Shipping 

We ship all modules directly from our labs in London using Royal Mail International Delivery with tracking service:

• United States: Seamless, hassle-free delivery. We fully cover the US import duties at checkout (DDP) to ensure nothing else is paid when received.
• EU (France, Germany, Ireland, Italy, Netherlands, Spain): The product price displayed on your screen is automatically optimized for your region. Selecting our DDP (Delivered Duty Paid) shipping option at checkout covers your local EU VAT, carrier handling fees, and postage upfront. Your module arrives straight to your door with absolutely no surprise fees or customs delays.
• UK & Rest of World: For the UK, Special Delivery or Tracked services are available. For countries outside the US and the EU list above, VAT/duties are not included at checkout and will be collected by the carrier upon delivery.

A Note on DDP Shipping Costs

The DDP shipping total at checkout might look higher than standard postage, but it bundles everything together for a hassle-free delivery. The rate shown at checkout includes the actual tracked postage (~£10), your exact local EU VAT rate (19-23% depending on your country), and a minimal £1 carrier handling fee for pre-clearing customs.

Modular Grid

Swell in Modular Grid: Modular Grid Swell

Swell in action

Hear Swell in the wild. Follow us on Instagram(@bartola_valves) or check out our YouTube channel (@BartolaInstruments) for patch ideas, sound design tutorials, and performances by other artists.