If you have Mediator or G-REX take Terratec 512i Digital.
Terratec has much better sound quality than Delfina.
Below the Terratec 512i spec:
With 8- and 16-bit mono and stereo playback and 16-bit stereo recording plus user-selectable sampling rates from 5kHz to 48kHz, the Terratec 512i Digital produces precise audio fidelity.
TOS-Link optical output lets you store your valuable recordings on external devices such as MiniDisc- or DAT-Recorders, at a sampling rate of 48kHz without quality loss. With up to 4 channels for connecting 2 or 4 loudspeakers and top-quality recording and playback at up to 48 kHz you can enjoy crystal clear sound all around.
Features:
• PCI DMA sound card
• 32-bit interface; PCI 2.1 compliant
• 8- and 16-bit mono and stereo recording and playback
• 18-bit codec with analogue 3D stereo enhancement
• Enhanced Full-Duplex (recording and playback)
• Recording and playback of all audio sources
• Very small CPU overhead; Terratec 512i Digital works as a PCI busmaster
• User-selectable sample rating from 5kHz to 48kHz
• Digital output; optical 48kHz (TOS-Link)
• 2 line outputs; stereo (3.5 mm)
• Line input; stereo (3.5 mm)
• Microphone input; mono (3.5 mm)
• CD-Audio input; stereo (MPC3)
• Aux In; stereo (MPC3)
• TAD I/O
