Does the Vox AC 30 custom classic actually have switchable channals . ? i looked in to it and on the pedal u get with it there are just switches for the tremalo and reverb.

so does this mean without actually touching the amp u can only have clean or dirty channel ?
No, they have two inputs. If you want to use a signal splitter (A/B Box) you can switch between inputs but the difference isn't the same as a two-channel amp. The inputs are mainly for a change in tone rather than a difference in gain. Your best bet is to use an OD pedal and guitar volume to adjust gain.