I have owned a Crave for a while now, but only recenly starting delving into the patching options more. So here is a useful nugget about how to use the Modwheel on an external synth to control parameters on Crave.
Assign Ouput
There is an output port on the Crave called Assign. Connect the Crave via USB to a computer and use the synthtribe software to set Assign Value to MIDI CC#1

Now the Modwheel on an external synthesizer (which by default usually uses MIDI CC#1) connected via MIDI can control the Input parameter that you patch the Assign Ouput port to, such as VCF CutOff or VCF Res
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[…] It is semi modular since there is a patch bay with 32 minijack patch points, which can be used to connect and modulate the internal modules, as well as external gear. The patch bay allows for a lot of creative and experimental sound design, and it makes the Crave compatible with Eurorack and other modular systems. The Crave also has a MIDI input and output, a USB port, and a 1/4 inch audio output. It can be powered by a 9V adapter or by USB. Lastly the Crave also can use Behringer Synth Tribe app, which can be used to edit the sequences, change the tuning, update the firmware or set the synchronization settings. Also in the App is a handy setting for using the Crave with a Modwheel […]