just playing around with the SD software Wave Agent Beta for the first time on an actual recording of a show, and it was a little confusing at first with the numbering schemes of the channels. i figured it out but i thought i would explain here in case it helps anyone. i have a mixpre-6, and i don't use the L-R mix, only iso tracks. last night i recorded one pair of mics to channels 1 and 2 (xlr) and another pair of mics to channels 5 and 6 (stereo 1/8" aux/mic in) with channels 3 and 4 (xlr) empty/unused. as i see it, there are 3 ways of numbering these tracks:
1) the way they are numbered in/on the mixpre unit itself -- channels 1-4 are xlr, channels 5-6 are aux/mic in or usb or whatever.
2) same as in 1) but including the L-R mix, shifting the numbers accordingly. so the L-R mix is now channels 1-2, channels 1-4 are now 3-6, and channels 5-6 are now 7-8.
3) numbering them in order based on only the channels you happened to use. so in my case, because i used 4 channels, channels 1-2 would be 1-2 and channels 5-6 would be 3-4.
the SD software shows a table where the first two column headings are "channel" and "interleave". the "channel" column uses the numbering scheme in 2), accounting for the L-R mix. the "interleave" column uses the numbering scheme in 3), referring only to the channels used in that particular polywave file. after experimenting with the matrix for splitting files, i realized that the matrix requires you to select the channels you want according to 3) or "interleave". at first i tried selecting according to the numbering scheme in 2), or selecting channels 3-4 and 7-8 as my two output files. this didn't work, as it detected channels 7-8 to be blank, despite listing 7-8 as existing channels under the "channel" column header. a little confusing! anyway, thought i would share this in case it saves someone else a headache.