Channel changes not working (fixed)

Hi all,
I've been trying to tab something out where the bass switches from fingerplucked to slapped, then to slap and pop, then back to slap and finally back to plucked. I've not had too many problems with it, but for whatever reason when I play it back the first channel change doesn't occur (though all the rest do). Can anyone help figure out why this might be?

Any and all help is greatly appreciated.