I've just bought the new  Fireface-UFX , last week.The previously  my audio interface is RME Multiface(first version).
..My questions..
1)Why the Buffer Size /latencies in fireface setting of  Fireface-UFX can only set from 48 up to 1024 samples ?
But in the UFX's manual on page 7th, tell me that UFX can be set  "Buffer sizes/latencies from 48 up to 8192 samples selectable".
2)Why  the RME Multiface can be set from 32 up to 4096 samples,but UFX can not ?
3)in total mix, What is "listenback" function?
4)in total mix, What is "cue" function?
...Big thanks
My details,
- My comp with  UFX is worked through on via Firewire 400.
- In my DAW (Nuendo 4.3) session  is set to  24 bits / 48k.
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My details,
- My comp with  UFX is worked through on via Firewire 400.
- In my DAW (Nuendo 4.3) session  is set to  24 bits / 48k.

Comp..
CPU : intel core i7-2600k - 3.4 GHz
Mother board : GIGABYTE Z68X-UD7-B3 LGA 1155 Rev.1.0
Graphic card : ASUS Radeon HD6950
RAM : "Kingston Hyper X 4GB ..PC DDR3-1600 (  KHX1600C9D3LK2/4GX  )
Case : Corsair 600T
Power Supply :  Cooler Master Silent Pro M 1000w
HD for OS_1TB , HD_Music..Job_1TB  , HD_Video_1TB   :   SATA3- 6.0Gb/s_Western Digital Caviar Black WD1002FAEX, 7200RPM 64MB Cache = 3 HDD
HD for Sounds  Library_2TB : SATA3- 6.0Gb/s_Western Digital Caviar BlackWD2002FAEX, 7200RPM 64MB Cache = 1 HDD
Dvd Writers : Asus
System :   Window 7 Ultimate Servicr Pack 1 ( 32 bits)

Audio interface : RME Fireface UFX ??? Firewire
FX card : TC PowerCORE..Element = 1 card

Programs :  Nuendo 4.3 , Wavlab 6 , Sony Vegas Pro 10 ,