From the Korg 01/W owners manual 1991:
All-digital AI square synthesis system:
From the tone generator through the filters and effect units, all audio is handled in digital form, ensuring high-quality sound with no signal loss.The 01/Wfd contains 255 preset Multisounds(multi-sampled PCM waveforms) provide a wide variety of ingredients for flexible sound creation. The built-in sequencer allows you to record 16-track data using realtime or step recording, and you can edit individual data events.
The 01/Wfd contains a Multi Digital Effect processor that provides up to 4 simultaneous effects, and can be used as two completely independent stereo effect systems.
A new radical wave shaping allows you to create sounds more complex and richer in nuance than the original.