M-Audio Omni i/o Инструкция по эксплуатации онлайн [10/30] 19296

5.8 Stereo Input and Insert Cables/Connections

A 1/4” TRS plug can alternately carry an unbalanced stereo audio signal over a

two-conductor cable with a shield, which applies to “Aux In” and the “Insert”

TRS jacks on the Omni. A TRS plug on one end with two mono TS plugs on the

other is in fact a stereo cable, and is sometimes referred to as an “insert cable.”

Keep in mind that the Aux Ins are stereo inputs. A stereo 1/4” TRS plug to two

1/4” mono TS plugs will work for connecting most MIDI sound modules into

the Omni Aux Ins, but you may have to purchase a cable for your particular

needs. This same cable will work for most outboard gear used with the Omni

“Inserts.” See the section, “10.4“ for more on this.

5.9 Line Levels vs. Mic/Instr Levels

Microphones and guitar pickups typically emit a low signal level, requiring a

“pre-amp” such as those found in the Omni Mic/Instr Channels 1 & 2. The

Omni Mic/Instr inputs provide up to 70dB of gain on the XLR mic inputs, and

up to 50dB of gain on the high impedance inputs.

This is enough gain to bring the signal up to the +4 line level at which the Omni

is capable of operating. The Delta card can be set to three line level references, -

10dB, “Consumer” (which is –4dB), and +4 dB, which is the default. These

settings can be found in the Delta Control Panel Hardware Settings page, under

“Variable Signal Levels.” Refer to section 10.3 for more information on setting

levels.

Most other signals are already at line level, and can be plugged into Omni Line

Ins 3 & 4. Different equipment, however, runs at different line levels. Check your

device’s documentation to see what line level it runs at, and set the Delta

“Variable Signal Level” to that setting. If you use the Line Ins on the Omni and

find that you’re not getting adequate record levels, you can try lowering the

“Variable Signal Level” setting. You can also experiment with using the Omni

pre-amps, which you might find gives some line level signals a little needed

“punch.”

5.10 Virtual Tracks

Often, instruments such as MIDI gear that is being played by a sequencer, is not

recorded onto the recording device. When not recorded, these MIDI tracks are

referred to as “virtual” tracks. MIDI instruments playing through the Omni Aux

Ins, therefore, are virtual MIDI tracks.