> ## Documentation Index
> Fetch the complete documentation index at: https://docs.solidyne.ar/llms.txt
> Use this file to discover all available pages before exploring further.
# Line channels
> Line channel operation
### Description
The **DX line** features **four stereo line channels**. Each channel has dual inputs, switchable from the front panel \[2].
* **LIN-1 and LIN-2 Channels**:
* Balanced stereo input (**RJ45** connector).
* Unbalanced stereo input (**RCA** connector).
* **USB-1 and USB-2 Channels**:
* Direct computer connection (equivalent to two external interfaces).
* Provide **PGM** and **REC** signal routing to the computer.
1. **Gain control.** Adjusts the input gain. On LIN-1 and LIN-2 channels, the gain adjustment is unified for inputs A/B. On USB channels, gain only affects the analog input.\
Should be adjusted so the signal remains around **0 VU** with the fader operating in the **–10 to –20 dB range**.
The digital level on the USB channel is adjusted from Windows©.
2. **A/B switching.** Switches between the main and auxiliary input.
3. **BUS.** Assignment to PGM (on-air) and REC mix buses.
4. **CUE.** Activates pre-fader monitoring.
5. **Operating range.** This section indicates the correct operational position for nominal signal level and proper input gain adjustment.\
Gain should be adjusted so the fader operates above -30 dB. The **OVL (7)** indicator signals overload, i.e., excessive input gain.
6. **Main level control (fader):** Adjusts the signal level in the mix.
### On-Air
To send the signal on-air:
1. Assign the channel to **PGM**.
2. Raise the fader.
The correct level is achieved when peaks reach **0 VU**.