Apply changes to all audio

i imported a video to sndtrk ( qt movie from fcp) and i have made changes to one of the trks. now i am not sure if the changes are being made to both left and right or if i am only changing the L channel. the changes are spotty so i dont want to have ta do both individually.

Q. is sndtrk pro 4 making changes to both L&R automatically or do i have to apply it by some other means? if i have to apply it manually then how do i?