This plugin is as boring as it sounds. It cleanly splits the signal into two to five bands using a variety of algorithms. Those bands are then sent to auxiliary outputs so they can be accessed and processed individually. Meant as an alternative to Bitwig's Multiband FX devices but with cleaner crossovers and a linear-phase option.
In Bitwig Studio you'll want to click on the 'Show plug-in multi-out chain selector' button and then on 'Add missing chains' to access the chains. The main output will not output any audio. To save time, you can save this setup as the default preset by right clicking on the device. Any new Crossover instances will then already have the additional output chains set up. You can also download this preset, load it, and then set it as your default preset for Crossover.
You can download the development binaries for Linux, Windows and macOS from the automated builds page. Or if you're not signed in on GitHub, then you can also find the latest nightly build here.
On macOS you may need to disable Gatekeeper as Apple has recently made it more difficult to run unsigned code on macOS.
After installing nightly Rust toolchain, you can compile Crossover as follows:
cargo +nightly xtask bundle crossover --release