String and Ensemble Sounds in Serum 2
The string machine recipe: saw stacks, slow envelopes and ensemble chorus, plus the EQ move that makes them sit in a mix.
Pads
How to Make Evolving Pads and Atmospheres in Serum 2
A pad that doesn't move is just a long chord. Here's the exact Serum 2 recipe I use: three detuned layers, slow LFOs, a granular texture layer, and one full patch walkthrough.