mark about the

[j2e4a8n]

Hi,

I have played with it and did not found much in the help file.

Is the mark only a reference point on the curve. A reminder?  Which can be useful sometimes.

Can we mark one channel only or all of them in one shot?

[ggroess]

The "mark" should be marking all channels. 
It is a reminder so to speak yes...I use it to mark a specific spot on the curve I want to adjust. 

It is a lot easier than trying to remember the exact spot on the curve especially when you have to switch channels.

Greg