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What sound are you after?

The Erica Synths fusion flanger is kinde big for your setup but it sounds lovely!

A Serge ResEQ could be fun. Or maybe even a QPAS. A filter in general would be nice.

Another good idea would be a 2hp dual sample and hold. If you put audio into the main input and then trigger it at audio rate as well, you get a simple but cool voltage controlled downsampled/"bitcrush" effect (in stereo if you use both).

I'm a fan of the Nautilus, for delay and effects:

https://modulargrid.net/e/qu-bit-electronix-nautilus

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Always the best option.