maybe you want to have a look here. I did some tests with the magnet in/out and TTL/manual:
Generally I think it is not a good idea to mix different strobe brands and try to use TTL; even with two identical Inon Z240 TTL is not reliable - at least in my setup with an E-M5. Maybe the E-M1 is better in that respect? (I doubt...)
For wide angle TTL does not make sense, and for macro it is convenient (if it works!), but I shoot manual now. If exposure is a bit too bright or too dark, just use your RAW converter.
p.s. TTL="fill" in the camera and S-TTL on the strobe