Nah, Numberwang is better for smashing together four gate signals. However, Numberwang would be perfect for triggering the Z8000, as it provides 16 gate outputs. Similarly, 8-Bit Cipher provides a ton of gate and CV outputs. BOOLs is another option for taking 4 gate inputs and providing 4 wackier gate outputs, although I would recommend the Intellijel Plog more for flexible logic options.
As @OlivierWah said, Cluster is great, if a bit massive. That’s just a gigantic, CV-controlled matrix mixer. It can be used for all sorts of patching, including CV controlled feedback patches.
The Neuron/Diff-Rect might be interesting. The Neuron section is a comparator. It adds an offset whenever the signal exceeds some value. This is great for smooth CV and audio, but might be boring with stepped CVs. The Diff-Rect takes in four inputs and provides various rectified sum and difference outputs.
Brain Custard CV would be a lot of fun, although it can sometimes be hard to hear what influence the inputs are having
. It’s nine chaotic oscillators with 3 CV inputs and 5 outputs.
Squid Axon would be a blast. It can act as an ASR, which is a great CV tool to have with a step sequencer. However, you can turn up the non-linear feedback pot and get all sorts of nightmare sequences with it.