Whoa...great trick there rigul..!!!   This thread has been very enlightening....Haven't spent much time with layers before this. I've been playing with layers and mixes for hours on end tonite and the past day or two. The differences between them are subtle yet the different ways to get them to work together can get complicated...I've been making multi layered single mats and then using them for the mixes....now with this little trick to go back the other way.....I think things could get hard to keep track of lol.... Good thing I got enough beer and pizza to last several more days.