This might have been glossed over when the 4nPRO came out...
COAX and SPDIF...I/O
You need one of the attachments to get all 4 analog channels...
Looks like you can take a SPDIF Input on 3/4 and still use the 1/2 XLRs...thats cool!
At 200 bucks this has more features than the TASCAM DR-70D...
Works with Ipad...
The U-44 is a compact, 4-in/4-out audio interface that enables you to record and perform wherever you are. Small enough to fit in the palm of your hand, the U-44 comes equipped with the features you need to record 24-bit/96 kHz audio anywhere.
The U-44 offers the same high-quality, low-noise mic preamps as our acclaimed H5 and H6 Handy Recorders, plus compatibility with Zoom’s Interchangeable Input Capsules for incredible possibilities. Use the U-44 with your PC, Mac, or iPad via USB—or as a standalone AD/DA converter and mic preamp. No other audio interface provides this much versatility, value, and performance.
Multi-channel and stereo USB audio interface for PC/Mac
Connect to iPad with Apple iPad Camera Connection Kit or Lightning-to-USB Camera Adapter (sold separately), plus 2 AA batteries or optional AC adapter for power
Two mic/line inputs with high-performance mic preamps
High-quality recording and playback at resolutions up to 24-bit/96 kHz
Compatible with Zoom interchangeable input capsules via 10-pin connector
Standalone AD/DA conversion
Functions as a two-channel mic preamp with analog and digital outputs
Approximately 4 hours of operation with 2 AA alkaline batteries
Includes download code for Ableton Live 9 Lite
Four-channel simultaneous inputs
Hi-Z support (input 1)
Zero-latency direct monitoring
Three TRS phone jack outputs
Dedicated RCA L/R and headphone outputs
S/PDIF optical/coaxial input and output
Gain control knobs for each input
+48V phantom power for inputs 1 and 2
Accepts standard AA alkaline or NiMH rechargeable batteries