> ## 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 and USB channel controls

## Description

D612 consoles feature **three stereo line channels**.\
The image shows the USB digital channel.

<img src="https://mintcdn.com/solidyne/Ohl2Yz3LdlfURVtJ/images/612/612-panel-line.png?fit=max&auto=format&n=Ohl2Yz3LdlfURVtJ&q=85&s=d4ef3a5fafaf77e02d67673c75e9d772" alt="612 Panel Line Pn" title="612 Panel Line Pn" className="mx-auto" style={{ width:"37%" }} width="631" height="1610" data-path="images/612/612-panel-line.png" />

1. Channel **gain** adjustment.
2. **A/B:** Switch between main and auxiliary inputs.
3. **USB OUT:** USB send assignment: PGM or REC (USB channel only)
4. **BUS:** Assignment to PGM and REC buses/outputs.
5. **CUE:** Activates pre-fader listening (<Tooltip tip="Pre-Fader LEvel">PFL</Tooltip>)
6. **OVL:** indicates correct operating zone. If the fader is below this indicator, it shows excessive input gain.
7. **Fader:** Main level control. Should operate in the zone marked between -20 and -10 dB.

***

## Channel Inputs

Each channel has two inputs, switchable from an A/B key on the front panel.

| Channel | Available Inputs                    | Connector   |
| :-----: | ----------------------------------- | ----------- |
|    3    | Balanced Stereo / Unbalanced Stereo | DIN-5 / RCA |
|    4    | Balanced Stereo / Unbalanced Stereo | DIN-5 / RCA |
|    5    | USB / Unbalanced Stereo Auxiliary   | USB / RCA   |

<Note>
  The USB connection also digitally sends PGM or REC to the computer.
</Note>

***

## Gain Adjustment

* Each channel has a **gain** knob.
* For USB signal, the level is adjusted from **Windows**.
* Adjustment should be made so that, with 0 VU meter level, the main fader operates **above the overload zone (OVL)**.

***

## Operation Use

* To send a signal on air:
  1. Assign **PGM** on the channel.
  2. Raise the fader.
* The correct operating level is achieved when **signal peaks reach 0 VU**.

***

## Fader Technology

All channel faders operate with **VCA** technology and use high-durability soft-touch attenuators.

* The fader handles **direct current (DC)** levels, which control a variable gain amplifier.
* This system guarantees **ultra-low distortion**.
* Completely eliminates noise produced by mechanical wear of faders.
* \+ 10,000,000 operations under proper use conditions.