When you install the Klipspringer hub, configure detects if the ALSA sound API is available, and if it is, support for accessing it directly is compiled into the libklip dynamic library to be accessed via Java classes in the net.avadeaux.klipspringer.alsa package. Then the klipdevices command shows the available ALSA devices with a klipalsa prefix, and they are available for configuring output sound device or input stream sources. The same physical devices are probably also available as Java audio system devices (also shown by klipdevices), but the klipalsa versions are potentially more efficient and predictable.
Most Linux systems (and some others) come with ALSA, but to make the API available, you probably have to install the development package. In Debian-based distributions (which includes Ubuntu and Raspberry Pi OS), use the command:
sudo apt-get install libasound2-dev
After that, configure should detect the ALSA API and enable the direct ALSA module.