Dave Smith Instruments TETRA - Manual (Page 45)

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Using USB
Tetra’s USB 2.0 port enables bidirectional MIDI communication with a
computer. A MIDI interface and MIDI cables are not necessary, just a USB
cable. Tetra is a Class Compliant USB device. That means it does not require
any additional drivers to be installed to communicate with a Mac or Windows
computer.
Tetra transmits and receives MIDI data via USB, but does not transmit audio.
Note: MIDI In and USB should not be used at the same time, as
overlapping messages from different sources may cause Tetra to respond
unpredictably. MIDI Out and USB can be used at the same time and
transmit the same data. Poly Chain Out is an independent MIDI bus and
can be used regardless of the “normal” MIDI connection.
USB Notes
Under Mac OS X, Tetra will appear as a MIDI port when connected via USB
and can be configured using the Mac’s Audio MIDI Setup application (typically
found in Applications/Utilities).
Under Windows XP, the first time Tetra is connected via USB, the “Found new
hardware” alert appears and Tetra is automatically installed—somewhat
misleadingly—as “USB Audio Device.” If there is already another Class
Compliant USB device installed, Tetra will show up as “USB Audio Device(2)”
(or 3 or 4 or...).
To determine which USB Audio Device is Tetra:
1. Open the System Control Panel
2. Click the Hardware tab.
3. Click Device Manager.
4. Expand “Sound, video, and game controllers.”
5. Right-click any “USB Audio Device” and choose Properties from the
pop-up menu.
The General tab of the USB Audio Device Properties window displays the
Device Type, Manufacturer, and Location. For Tetra, the Location should read
“Location n (DSI Tetra).”