E-Mu 404 Owner's Manual page 49

Troubleshooting
No S/PDIF I/O (OS X)
S/PDIF is not available at the 88.2/96 kHz sample rates. When these higher sample
rates are selected in the OSX Audio MIDI Setup, 2-channel mode is automatically
selected. When you switch the sample back to 44.1/48 kHz, 2-channel mode
remains in effect. To remedy the situation:
1. Click Go -> Utilities from the menu bar.
2. Double-click Audio MIDI Setup.
3. Select the 44.1/48 kHz sample rate and select 4-ch-24bit for the Audio Input
and Audio Output.
Simultaneous WDM/ASIO/AC-3 Playback (Windows only)
The 0404 USB 2.0 only supports playing back 1 stream format at a time. Each of
the 3 mentioned stream types has a priority associated with it. If a higher priority
stream type is opened while a lower priority stream is already playing, the lower
priority stream will stop playing. The stream priorities, from highest to lowest, are
AC-3, ASIO, WDM.
USB 2.0 vs. USB 1.1 Operation (Windows only)
The 0404 can operate in USB 2.0 or USB 1.1 mode. 96 kHz and 192 kHz sample
rates are only available while operating in USB 2.0. The included E-MU USB Audio
Control panel software includes an indicator to let the user know which mode the
device is running in.
0404 USB comes up in USB 1.1 mode (Windows only)
Always turn the 0404 USB power off before connecting or disconnecting the USB
cable. Hot-plugging the unit with the power on can cause the 0404 to power-up in
USB 1.1 mode. If you see the Windows message, "This device could perform
faster...", simply turn power off, wait a few seconds, then turn power on again.
0404 USB 2.0 Owner's Manual 49