M-Audio Duo USB [14/27] Duo operation on the pc

at either the Mic Inputs or the Line Inputs of the Duo. You will, however, not be

able to hear the software outputs from your computer in this case, so this option

may only be useful to you when laying down your first recorded tracks, i.e.,

when there is no other audio playing back from your computer.

In cases #1 and #2, the sampling rate for the Duo’s A/D converter will be

determined by the DIP switch settings on the bottom of the unit. See the section,

“Bottom of the Unit” earlier in this manual. It will give you more information

on how to set the DIP switches for the sampling rate of your choice. The bottom

of the Duo has a silk-screened guide that reveals the DIP switch settings.

In case #3, the sampling rate for the Duo’s A/D converter is controlled by your

music program or operating system. This is true whenever the Duo is attached to

the USB port, and both the Duo and the computer are powered on.

Duo Operation on the PC

The USB Audio Configuration Manager

When the Duo drivers are installed, a control panel is also installed into the

System Tray on your Windows taskbar. This control panel is the “USB Audio

Configuration Manager.” The configuration manager allows you to choose

between the Duo’s ASIO or EASI drivers and the Windows “MME” drivers,

which are WDM compatible with Windows 98SE or higher. To open the USB

Audio Configuration Manager, locate the M-Audio icon on the right side of your

taskbar, then double click the M-Audio icon.

MME drivers allow a device to be used in Windows, as well as music

applications that utilize these Windows drivers, and will appear as “USB Audio

Device” both in Windows and in your music program. ASIO is a driver model

developed by Steinberg, and is used by music programs that have adopted the

ASIO driver standard. EASI is a driver model developed by Emagic, and is used

by programs that have adopted the EASI standard. Check your music

application’s documentation to help determine which driver model it will use.