Patching by channel

The tutorials are great.  Thanks.  I went through and patched by rig in by channel so far so good (except for the LEDs fixtures which I will have to do by device).  Now, how on earth do I adjust the levels of each device.  They all seem to be controlled by fader #1 which only allows me to adjust all the lights at once.  What I want to do, of course is to adjust individual fixtures.  There is a tutorial that shows how to adjust devices but not channels.  Help.

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