Thread: My Realistic Eurorack
I agree that it would be useful with a clock to drive Rene. Your existing synths may already have one that you can use. In principle, any LFO will do. For more features, Tempi is a good choice. Another popular option is Pamela's NEW Workout.
I am not sure about the quantizer, though. Rene2 has a pretty good one built in, so that may not be as urgent.