I started messing around with the post possessor for icarver and made a test cut, what I'm cutting does not matter because I just did a rush setup of a motorcycle plate to see if I slowed down the Y axis enough to make it cut. I think so, I make .100" passes so I'm not digging in to the material. www.dropbox.com/s/8qmmaj7r4e1ixfo/IMG_0461.MOV
Not sure I understand your question Bob, this was a half inch deep cut and it did it with no problem, the video is much longer but my phone would not upload that size of file. I plan to play with it more this week and see if I can get a really sloooow Y axis cut but I think it is slowing down all the cuts.
As to your question and I think this will cover it, in the software I use for this Cut2d I set the pass cut depth and the software covers the passes for me so each line is cut in multiple passes untill it's done then it moves on to the next cut.
I also do not have multiple pass errors ussing cut2d like every other one done with I-picture. The file the post proc makes is gcode with an ending called .nc and this machine will read that file just like it will read a .gee code file I just DON'T run it through I-picture.
I'm going to try a new setting with the post p today but from my search on the web it looks like the post p slow down does not work I will find out today and post here. From what others are saying the gear drive on the Y is so much faster than the others that it may not slow down and if it does the others will be so slow it's painful.
Here is what I ended up with it seems slower to me this cut took 52 minutes which is still a lot faster than the other way for an 8x10 sign. Anyway I used a combo of software settings and post p changes and it performs in a way now that I can use. I guess i could have just cut a straight line with both settings and used a stop watch but I just wanted to be able to use it to cut drafting files like this one. Here is a video of the latest test: www.dropbox.com/s/6eoxlv19mua7qpi/IMG_0470.MOV
cut2d is a drafting program that out puts g-code and also uses any post processor to be compliant with the machine software, Mach 3 in my case. It will also take in any design already made trace it and make G-code from that.