I went and checked again, you’re right.
I was looking at the LFOs in the zone tab, but Trip uses Mono LFO midi modules for modulation and they are set to triangle waves.
I still can’t see how to get to LFOs in Sonic though. It seems if you load standard Sonic sounds into a layer, you get to edit LFOs, envelopes etc. via the layer editor (the L1 L2 L3 L4 buttons). As soon as you use something like Trip though, it always shows the instrument macro page. I don’t know if there is a way past that.
Halion Sonic comes included if you buy the full Halion package, so to be honest I don’t really use it.