Martinic are offering their Rheem Kee Bass plugin for free,to anyone who signs up to their site. The Kee Bass was one of the first monophonic string bass emulators with individual note tuning for relatively easy and accurate voicing. It was an early collaboration between a 1950s American businessman and a Japanese electronics company which became a cult-classic monophonic string bass synth.
The plugin emulates the thick bass sounds of the original keyboard alongside all of the visual and sonic quirks the original model possessed.Here are some of the features:
Here's a video of the original unit in action:
Get your free license here: https://www.martinic.com/en/products/kee-bass