SPL’s TwinTube is one of those magical devices that make subtle changes that result in a huge improvement in your tracks. Simply adding a bit of TwinTube’s analog tube warmth can dramatically improve vocal and instrument tracks. TwinTube also increases perceived loudness without changing actual gain, making it an incredibly useful tool to have in your signal-processing arsenal.

All the character, tone, and utility of the hardware version is now available as an Analog Code plugin. As with all of SPL’s Analog Code plugins, the TwinTube is an exacting software model of the original analog hardware processor.

TwinTube combines two essential tube effects in a single processor: saturation and harmonics processing. Both stages process the signal separately, so you can apply them individually or combine them.

Harmonics processing can be applied to four different fundamental frequency bands to improve presence and clarity with minimal affect on signal levels. The saturation control behaves similarly to tape saturation, adding warmth and density, regardless of sound source.

The Analog Code
During listening tests of this technology, a hardware developer remarked that SPL had “cracked the Analog Code!” and in the process, coined the name of SPL’s software product line.

Download the fully functional 14-day demo today to hear for yourself! (No dongle required!)


  • Precisely modeled plugin version of SPL’s world-class tube effect processor
  • Tube and tape saturation effects
  • Increase perceived gain without increasing level
  • Subtle coloring to dramatic distortion with a simple knob tweak.
  • Harmonics and saturation controls that can be used separately or combined
  • Works magic on a wide variety of signals including vocals, acoustic guitars, drums, brass, and more
  • Store up to four different sets of adjustments.
  • Mouse Wheel control for rotary controls and faders.

Audio Examples

Industry Reviews

  • Soundprank/Colin E. Fisher
    Soundprank/Colin E. Fisher

    This plugin delivers vacuum tube saturation for days, from subtle warmth to dirty grunge, it sounds fantastic on digitally harsh sounds, and absolutely KILLS on vocals and brassy… Read More

  • Ethan Mates
    Ethan Mates

    Saturation is one of the most important keys to mixing in the box, particularly heavier music, and this plug delivers tons of tube vibe and thickness for days!

  • Thomas Gold
    Thomas Gold

    One of my "go to" tools for warming up a sound. I just throw it onto a channel and I can instantly get a warmer, thicker sound. I can easily dial in more harmonics and saturation to taste. Simple… Read More

  • James Wiltshire
    James Wiltshire

    Anyone working with digitally sourced material needs this in their production life. It just spits out vibe.

  • Stonebridge

    Tired backing vocal and poorly recorded guitar saver. Amazing results and super easy to work with!

Customer Reviews

  • ★★★★☆
    Quality Salturation Effect
    by m2
    I love the way TwinTube sounds, and having independent controls for the saturation and harmonics is lovely. One small niggle: I’m not the biggest fan of the clunky multi-button harmonics frequency… Read More
  • ★★★★☆
    Round Sound
    by Willem
    Great for adding more gain, colour and saturation. Can give you authoritative lows and fuzzy highs. Being able to dial in the right amount of saturation at the right frequencies can make a sound… Read More
  • ★★★★★
    by AreG
    TwinTube sounds incredible on almost anything - vox, synths, bass, percussion, groups etc. GUI needs a modern update, cf SPL Transient Designer. Moreover, the VST3 version does not run well (VST2… Read More
  • ★★★★★
    Keyboard’s Best Friend
    by Dan
    I find myself using this on almost every keyboard track, eps sound more alive, organs dirtier and grittier, boring synth pads become epic. I have this on my synths when I audition them, sounds that I… Read More
  • ★★★★★
    Add the harmonics you didn't capture
    by Mixedby6
    This is one of those plugins that you need to hear to believe, The lack of vibe and mojo in modern digital recordings is no longer a problem


Supported Plugin Formats
AAX DSP, AAX Native, AU, AAX AudioSuite, Venue 32-bit, Venue AAX, VST2, VST3

Supported Operating Systems
Mac OS X 10.8 through 10.13
Windows 7 through 10
Pro Tools 10.3.10 or higher or any VST/VST3/AU-compatible host running on a supported operating system

Intel CPU only (minimum 2 GHz recommended)

Intel-compatible CPU with SSE2 instruction set (Pentium 4 compatible or higher; minimum 2 GHz recommended)

System Requirements
Display resolution: 1440 × 900px or 1280 × 960px or higher
Memory: 2 GB RAM


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