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Kee BassBring some groovy, bassy vibes back from the ‘60s and straight into your music with Martinic’s faithful emulation of one of the first monophonic string bass simulators, the Rheem Kee Bass.

The Martinic Kee Bass AAX/AU/CLAP/VST plugin is based on the original electronic schema and an actual physical Kee Bass. Firstly Martinic modeled the instrument precisely (no sampling at all), then a few modern features were added to make it more versatile and unique, such as an extended range, a filter, and modulation.

And best of all… you can get a licence now FOR FREE!

The Kee Bass is also available as part of the Retro Pack, a collection of Martinic’s grooviest instruments and effects with a bundle discount. If you would like instructions for this plug-in, you can browse through the manual page.


The Kee Bass was one of the first monophonic string bass emulators. Note tuning was accomplished through individual trim pots, one per key. This made tuning relatively easy and accurate. They have a limited lifespan, however, if one key ‘went’, the others would remain stable, making for an easy fix and a reliable product. The Kee Bass, interestingly, used the same power supply that was used for televisions at the time. Read more about the history of the Kee Bass.


Physical modeling (no samples used) of vintage Rheem Kee Bass

  • Bass Fuzz sound – built in
  • Percussion – Fast decay
  • Percussion – Slow decay
  • Sustain
  • Bright-Mellow option on all sounds
  • 2 Full Octave Keyboard
  • Modeled Solid State Electronic Circuitry
  • 7.5 MB Portable Lightweight Beauty
  • Plays Booming String Bass Notes when loaded into any AAX/AU/CLAP/VST host

Advanced Features

  • Level adjust
  • Adjustable 25-note tuning
  • Extended 128 MIDI note range
  • Velocity-sensitive
  • Pitch bend ±2 semitones
  • All settings MIDI learnable
  • Poly mode
  • Low/high/last note priority
  • Attack/decay adjust
  • Low pass filter with resonance
  • Filter LFO/envelope modulation
  • Wide range of presets
  • Fine tuning
  • Transpose/octave shift


Protected by FastSpring generated license key file. No dongle or online activation.

ace stamp v1Martinic’s ACE® modeling technique ensures the highest quality, most accurate recreation of analog instruments and FX. When you see the ACE® logo, you know you’re getting the best.

Audio demos

All sounds here are created with the Martinic Kee Bass and demo its unique bass sound from the 1960s.

YouTube demo


Claim your free license!

A new license includes free upgrades through Kee Bass version 1.x.x.

Full Version


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Free trial

Before claiming your license you are allowed to try the Kee Bass free of charge for testing purposes and in non-published work. When the Kee Bass runs in demo mode, white noise is added to the output signal.


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