User manual M-AUDIO QUATTRO USB

[. . . ] . 16 QuattroMac-072601 1 Introduction Thank you for purchasing the AudioSport Quattro USB Audio Interface, designed and manufactured by M Audio. The Quattro provides four audio inputs and four audio outputs, plus a 1x1 MIDI port on your USB equipped Macintosh computer. High performance, 24-bit/96kHz audio is now possible in a compact, portable package. All audio inputs and outputs are switchable between balanced (+4dBu) and unbalanced (-10dBV) operation to accommodate any audio need. [. . . ] The OMS program is a MIDI manager, which MUST be installed prior to running the AudioSport Quattro Installer in order for the Quattro MIDI driver to be properly placed in the OMS folder. See the next section, "Configuring OMS" for more information. The AudioSport Quattro comes with an installer program that will place all driver components except the Quattro ASIO driver in their proper folders. The Quattro ASIO driver will be placed in a folder on your desktop, and must be inserted into your music program's ASIO folder, provided that your music program uses ASIO. 1. On the Driver Disk that came with your AudioSport Quattro, locate the folder that contains the AudioSport Installer for the Macintosh. The Installer program installs all Quattro extensions, plus 6 2. 3. 5. creates an "AudioSport QUATTRO Asio" folder on your desktop, containing the Quattro's ASIO driver. You will now need to name and save your new Studio Setup (or use the default name) before you can assign various instruments to the QUATTRO's output and input. Your QUATTRO is ready for use with MIDI. 7 You can run the OMS `Test Studio' utility by going to the `Studio' menu and releasing the mouse on "Test Studio". Playing a note on your keyboard will give you an audio message from your computer, "MIDI received, " while the arrow pointing to the keyboard icon flashes. Clicking on a keyboard icon with the mouse pointer will send a tone cluster to the QUATTRO MIDI output port. Generally, this means selecting "OMS Compatibility, " or "Open Music System" for your MIDI system setup. Hooking up your AudioSport Quattro The Quattro provides four line inputs and four line outputs, and will accept a +4dB balanced signal on 1/4" TRS plugs (tip-ring-sleeve), or a -10dB unbalanced signal on 1/4" TS plugs (tip-sleeve). You may connect the output of a line level instrument such as an electronic keyboard or instrument preamp, the output of a microphone preamp (a mic preamp is required for use with a microphone), or the output of a CD player or similar line-level device. Check your device's documentation for information on its operating line level (+4 balanced or -10 unbalanced), and see the section, "Using the Input Level and Output Level Switches" in this manual. You may connect the four outputs of the AudioSport Quattro to a mixing console, or use two of the outputs for a stereo send to a monitoring system (power amp and speakers, or a home stereo), powered speakers, or a headphone amplifier. Again, check your device's documentation for information on its operating line level, and see the section, "Using the Input and Output Level Switches. " The diagrams below illustrate those scenarios. Typical Setup #1 shows the AudioSport Quattro with a mic/instrument preamp plugged into Inputs 1/2 (we suggest the DMP3 Preamp by M Audio), and a MIDI sound module's audio outputs plugged into Inputs 3/4. Typical Setup #2 shows a CD player plugged into Inputs 1/2, and Outputs 1/2 plugged into a monitoring system. 8 Sound Module MIDI The Quattro and the Macintosh Sound Manager The Macintosh Sound Manager will allow you to select the AudioSport Quattro as the system's audio input and output device. However, if you are using the Quattro ASIO driver, you should leave the Sound control panel set to "built-in. " Open the Apple menu, then select "Sound" from the Control Panels list. The Macintosh Sound Manager is limited to stereo input and stereo output, so only Channels 1 and 2 are active on the Quattro under Sound Manager. The Quattro will operate at 44. 1kHz sampling rate at the 16-bit setting in this instance. At this point in time, most music programs designed for the Mac utilize ASIO drivers. [. . . ] Shown here is a controller keyboard plugged into the Quattro's MIDI In port, and a sound module plugged into the Quattro's MIDI Out port. 13 Optimizing Your System for Audio Network cards and devices such as print monitors can cause interference with USB audio, the resulting effect being clicks and pops in your audio performance. As stated in the "Theory of Operation" section, the AudioSport Quattro requires all of the USB bandwidth, so definitely do not have any active USB devices attached when using the Quattro. If you experience clicks and pops in your audio tracks, consider temporarily disabling network cards or modems. Also, if your system board has an AGP graphics slot and you are using a PCIbased graphics card, purchasing an AGP graphics card and utilizing the dedicated AGP buss may improve performance both in audio and graphics. [. . . ]