This might help:
It's a long time since I had a Trip 35, but I'm sure it's got a leaf shutter, so X sync (for electronic flash) should be good at all speeds. I think but am not sure that the Trip had a 2-bladed combined aperture/shutter, if so it will work on a program from about 1/500 at f16 to 1/30 or so at f2.8, with no user settings possible.