Simulate scalp recording

hey @Francois is there any good matlab code for step 3, simulating generic signals? using Sin and Cos is very unrealistic and I was not able to find anything else online.
Is there any Update on Brainstorm for data simulation?
I was wondering if its possible to cut a EEG data from actual Data (I.e from EEGEpilepsy Data) and use that as the generic source … is that possible?