[1] Just like its predecessors Kronos and OASYS, the Nautilus is a custom software synthesizer running on an Intel x86 processor and the Linux kernel with RTAI extensions.
In comparison to its predecessors, the user interface on the Nautilus has been redesigned, but some software and hardware features of the earlier models are no longer included, with a reduction in list price.
On July 14, 2023 Korg announced an updated Nautilus AT in 61-key and 88-key versions which add channel aftertouch, also available as a factory upgrade option for the original models.
4) The HD1 High Definition Synthesizer - sample-based synthesis and wave sequencing to generate sounds from the multisamples stored on an internal solid state drive.
8) The MOD-7 Waveshaping VPM Synthesizer - classic FM sounds, SysEx compatibility with Yamaha DX7, Variable Phase Modulation (VPM), waveshaping, ring modulation, samples, subtractive synthesis, and modular patching.