QTR-Quadtone RIP

Hello everybody at the QTR group,


this is Thilo from germany with a question regarding a detail in the 
"Curve Creator" within QTR.


For every ink one can choose the following points/despriptions: "Gray 
ink", "Toner", "Toner 2", "Copy curve from" or "Load curve".


Recently I started to follow Paul Roark on his path to port Eboni-6 to 
the Epson 3880 in a "Variable-Tone" format, details here:
http://paulroark.com/BW-Info/3880-Eboni-Variable-Tone.pdf


Until now, using an 1400 and Eboni-6, I mostly used the "Gray 
ink"-option in the fields. Now it's the first time that i use a (light 
blue) toner, too.


My question: What ist the difference between the options "Gray ink", 
"Toner", "Toner 2"?


Is QTR handling the ink channels in a different way, depending on which 
option I choose?


Or are the options "Gray ink", "Toner", "Toner 2" just a convenient 
and/or informative way to keep record on the functions of these inks in 
a certain curve? (In the case of the 3880-Eboni-Variable-Tone the yellow 
ink is marked as "Toner", but there seems to be not difference when i 
make it a "Gray ink".


I haven't found this detail anywhere - hope this is not a silly question.


Best - Thilo