Hello alexwong,
Yes, levels on the H90 can be adjusted at the Program or Preset level; they can even be adjusted at the insert level. The key thing to do is make sure you’re using the correct operating level, intrument or line level, and this can be adjusted in the System Menu under I/O. May I recommend this video? https://youtu.be/5y14LwN9oAk?t=2403&si=Oh-ik0PKCQjwGMDJ
