The mode you have active on the channel 1 affects the dynamics of the channel 2. Basically the higher the gain of mode selected on channel 1 the more compressed is the sound of channel 2. It is a subtle difference but there is a difference.
It is IMHO a great feature of this amp. When using ch2 I usually choose the ch1 mode that best suits my guitar and what I'm playing. This offers unbeatable tweakability especially for recording. A lot of people wonder if this is a bug or was thought...
I had a mesa boogie nomad where such thing also happened but it was a design bug that was latter corrected
I would say that with the Einstein this was thought to be like it is!?
Anyway it is a feature of this amp that I really like
Well, it is called Einstein. There were a million possibilities in his head as well as this head.
I swear I can hear mine breathing heavy at night in the other room.