Midi clock signal is generated by the Xone PX5 mixer from the master output (or a single channel depending on how the FX engine is routed). The clock signal is routed into Ardour and the Poly Effects Beebo where is it used for syncing FXs and LFOs.

Mixxx is used for playing tracks in external mixer mode. Each deck’s audio is routed to a corresponding channel in Ardour.

Each channel in Ardour has a High and Low pass filter to emulate the Model 1. I love mixing with filters, but won’t pay that much for a mixer. Each channel also has an external FX send for using the Poly Effects Beebo, and two internal FX sends for using various VST plugins (eg, delay and reverb). FXs can be synced to the midi clock signal generated by the Red Sound Voyager.

Both the Xone:K2 and the Midi Fighter Twister are used to control everything in Mixxx, Ardour and some stuff on the Beebo.

See also my Ardour midi binding map.

I use a script symlinked into a location in my path so I can just type pmixxx to start the programs and make the pipewire connections.

https://github.com/apmiller108/audio/blob/main/pipewire_mixxx_startup.sh