I found out tonight that when setting up to record in SAWLite using SAC Link, import selected channels, it will only bring over channels in slots 1-48 - even if you make a selection with a legal number of channels, if they happen to be in slots 49-72, the are just silently ommited.
I happened to have my tracks in the upper band channels and couldn't figure out why they were not coming across ... as soon as I copied them to slots below 48, they came in.
Doubt this will get changed, but it is certainly something to be aware of - if you want to record them, they MUST be in the first 48 slots.