Thank you for answer! Well, I enjoy Catalyst sound and I understand this is low cost amp, but this switching is dissapointing for me... I am going to use midi switch in future, I thought this could help a bit, but it seems not to.
edit: In my opinion midi switching could help in case I would not change channels, as you wrote, but only parameters of channel (i.e. level of gain). I believe this, since turning on/off effect on the same channel is ok.