Audio Pro Rack-mountable 8 x 8 USB 2.0 Interface with MX Core DSP Technology 8R - Manual (Page 5)

User Guide 4 Fast Track Ultra 8R
5 Controls and Connectors
Front Panel







































1. Instrument Inputs 1 and 2 (Inst) – These front-panel connectors provide instrument-level inputs for channels 1 and 2.
Each of these two inputs will accept a high-impedance instrument level signal on an unbalanced 1/4” plug. Set the
Mic/Line - Instrument switch
2 to the “in” position to activate the corresponding front-panel input.
2. Mic/Line - Instrument Level Switches ( / ) – These switches select the input source for
channels 1/2 between the front-panel Instrument inputs 1 and the rear-panel Mic/Line inputs 20 .
3. LED Clip Meters (Clip) – These red LEDs illuminate when an input signal reaches a sustained clipping level. Reduce
the channel’s Input Gain level
5 if the LED glows steadily red.
4. LED Level Meters – These green LEDs illuminate when an input signal of -40 dBFS is present at the corresponding input.
5. Mic/Instrument Gain/Pad 1-8 (Mic/Inst Gain Pull -20dB) – These knobs adjust the input gain level for channels
1 through 8. Pulling the knob out will engage a 20 dB pad on the Mic and Instrument input. Pushing the knob in will
disengage the pad. (Note that the level controls only affect the XLR mic and front panel instrument inputs, but do not
affect the line-level inputs.)
6. Phantom Power Switches (Phantom Power) – Pressing these switches activates the phantom power circuitry for the
corresponding group of four mic inputs (1 through 4 or 5 through 8), illuminating the Phantom Power LED
7 and sending
48V power to the four associated XLR inputs 20 , for use with condenser microphones requiring external power.
7. Phantom Power LED – These red LEDs light to indicate that the corresponding phantom power switch 6 has been
pressed, applying +48V phantom power to the selected group of four mic inputs.
8. Headphone Output Levels ( 1 / 2 ) – These two knobs control the volume level for the two headphone outputs 9 .
9. Headphone Outputs ( 1 / 2 ) – These two 1/4” stereo (TRS) jacks are independent of the main audio output level,
and are controlled by the headphone output knobs 8 . The first headphone jack outputs the same audio signal as
rear-panel outputs 1/2 while the second headphone jack outputs the same audio signal as rear-panel outputs 3/4.
10. Main Output Level (Output) – This knob controls the main output level (output pair 1/2).
11. MIDI Input LED (MIDI In) –This green LED lights when MIDI data is present at the MIDI input 18 .
12. MIDI Output LED (MIDI Out) – This green LED lights when MIDI data is present at the MIDI output 18 .
13. Power Switch ( ) – Pressing this button will power on Fast Track Ultra 8R, illuminating the front-panel Power LED 14 .
The unit must be connected to the external power supply.
14. Power LED (Power) – This blue LED lights when the power switch 13 has been pressed and power is being received
from the external power supply.