A test equipment sound is not pure technically. The gain stage has a vacuum tube also the frequencies below 60hz do sound anything but a sine wave. All these are the signature of a vintage sonic richness.
The core idea here is was basically recreating an instrument with a test tone equipment sound in software form but with the approach and design which sonicLAB has followed on its previous products.
The initial concept is based actually on sonicLAB PaSSBot.
Fundamental is available for OSX , Windows and iOS platforms as VST3, AU, standalone and AUv3 formats.
All sonicLAB products are 64bit only.