This Kontakt instrument uses samples from a vintage Hewlett Packard sine tone generator. An odd choice, perhaps, but the results aren't as pristine as modern digital synths and when coupled with LFOs, effects, envelopes, etc., it makes perfect sense. Think classic sci-fi blips and rich sub tones. With plenty of tweaking options at such a low price, it's hard to fault.
The only library to achieve 10/10 this month
Cheers,
Stephen