Looks like they do at least provide an un-upsampled digital output. Here's the specs from their site:
- USB-to-S/PDIF Optical Out and 1/8" Mini-Analog Line Out
- S/PDIF Optical Out can transmit Linear PCM, AC3, or DTS
-Sonica Supports the following Output Formats
• 24-bit Linear PCM
• 16-bit Linear PCM
• 16-bit AC-3 over optical connector
• 16-bit Dolby Pro-Logic over optical connector
• 16-bit DTS over optical connector
• Windows 2000, or XP, or Max OS X version 10.1.5 or greater required for multi-channel output
- Sonica supports the following sampling frequencies (Hz) - 8000, 9600, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 88200, 96000