Engine OS 2.0 now includes some major updates:

New look user interface
Built in lighting control for Philips Hue and DMX lighting with Sound Switch.
Run your DMX lightshow directly from the Prime 4 once you have synchronised with Sound Switch. You can also sync Philips Hue lights with the Prime 4 with no software or programming required.
New database structure with faster access, searching, analysis etc.
The database in 2.0 has been completely rebuilt to provide accelerated browsing, lightning-fast song analysis, enhanced system stability, and a significantly smaller database size. These new under the hood adjustments offer the user a streamlined experience when managing, browsing, and playing the music they love.

Ableton Link Compatibility
Users can now sync tempo with external hardware using Ableton Link over both wired and wireless networks. Once Ableton Link has been enabled, an orange link icon will be shown in the top right of the toolbar providing the number of linked devices, sync lead tempo, and phase meter showing the current beat position. When synced, the tempo will match the tempo of the longest playing device. The lead tempo can be adjusted from any device and all other linked devices will automatically follow.

Playlist Deck
Users can now assign a deck as a Playlist Player providing continuous playback with automated crossfading. The crossfade time can be adjusted in the Control Centre settings menu. Playlist Deck is available for Prime 4, Prime 2, and Prime GO.

Previous Engine updates include:
Adds support for Beat Port Link and SoundCloud GO+ streaming services, improved BPM analysis, recording of the mic channel and ability to adjust the gate settings for each mic input.
The new quick source menu lets you load different sources on to either deck so you can mix between USB and SD, Tidal to Soundcloud, SD to Beat port and more.
Support for Dropbox linking to access tracks in your personal cloud storage from anywhere.
Support for Beat source LINK streaming service
Track preview: listen to a track without having to load it to a deck.
Reads variable beat grids prepared in Engine Prime 1.6.
Prime 4 is now fully supported by Virtual DJ 2021 with a Pro license. Browse tracks, trigger samples, control stems and stream directly from the software. No setup required yet huge customisation possible with the comprehensive setup options.