92.3 Front Panel Descriptions1. Power LEDIndicates that the unit is powered on whenlit.2. USB LEDIndicates a valid USB connection to the hostcomputer when lit.3. MIDI In LEDindicates presence of incoming MIDI data atMIDI input.MIDI Out LEDindicates transmission of MIDI data fromMIDI output.4. Mic/Line / Gtr Switchesswitches inputs between Mic/Line level andHi-Z Level.5. SIGNAL LEDindicates the presence of audio signal on therespective channel. (Specifically, when inputlevel exceeds –42 dBFS.) Only functions onanalog input.OL LEDindicates an overload on the input level tothe respective channel. (Specifically, a levelof –2.5dBFS.) Only functions on analoginput.6. A and B Input Trimsinput level adjustment. Rotate clockwise toincrease input level of analog sources.7. Line Out Levelcontrols the level to the RCA (analog)outputs.Headphone Out Levelcontrols the level to the headphone outputs.8. DATA Wheelsends continuous controller informationto application. In Cubasis, functions asa shuttle wheel if no SELECT switch is helddown, or as PAN control if a channelSELECT switch is pressed and held.)9. Fader NULL Switch and LEDwhen pressed, disengages physical fadersfrom the application. Used to match US-224’s faders with those of the softwareapplication’s internal mixer. When usingFADER NULL, the selected channel’s RECand SEL LED’s indicate the US-224’s faderposition relative to the associated channel inCubasis’ mixer.10. Input Monitor Switch and LEDtoggles Input Monitor adjust mode. Whenthe associated LED is on, the FADER andMUTE switches for channel strips 1 and 2control the level of Inputs A and B to the US-224’s stereo output.11. Bank Switches and LEDspages between successive banks of fourfaders.12. Transport Controls:REWtransport rewind.FFWDtransport fast forward.STOPtransport stop.PLAYtransport play.RECORDtransport record.13. LOCATE << and >>moves transport to L and R locate points.SETholding SET and pressing << and >>buttons sets L or R locate points, either onthe fly or while stopped