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I'm under the impression that using the Line Outs as cue mixes will provide a stereo signal.

For instance, within Studio One (3) I've made two extra cue mixes from Line Outs 5&6 and 7&8 to send through my stage snake into my drum room.

Despite using mono-to-stereo patch cables from the outputs, I receive only one side back in my headphone mixes.

Is my Studio 192 broken ?

I think the problem may be the mono/stereo patch cables. Can you describe the exact connection?

It is a Y cable with 2 1/4" mono jacks that terminate to a 1/4" input. Plugged into the that input is a TRS cable from my stage snake, and from the input panel on the snake is a TRS plugged into a powered headphone amp.

josephmeyer wroteIt is a Y cable with 2 1/4" mono jacks that terminate to a 1/4" input. Plugged into the that input is a TRS cable from my stage snake, and from the input panel on the snake is a TRS plugged into a powered headphone amp.

So you have a Y cable with 2 1/4" male connectors coming out of the 192, that terminate to a 1/4" input? Is that input TRS or TS, and is it a male or female connection? I think this is the problem starting.

Also the trs connection you are referencing as coming from the snake, is a balanced connection, not stereo. TRS balanced is the same as XLR balanced, just a different connector. A trs connection in this instance carries a positive, negative, and ground. A headphone plug "TRS" carries left right. That is why you are only getting one side.

I don't know what headphone amp you are using, so I can only guess the connection types. The HP amps that I use will take TRS (balanced) for the left channel, and the same for the right channel. That gives me the stereo connection at the phones. Look at the Presonus HP 2 or HP 4 for examples of how to connect.

I believe the 1/4" input on the end of the Y cable is a TRS, though now I'm beginning to cast my doubts. I've attached photos of my connections. I can't see anything on the Y cable that tells me if it's a TRS or just a TS.

In the top picture, the 1/4' male connectors are TS (unbalanced mono). You can tell by the connector. There is only one black band. TS stands for Tip/Sleeve.

The problem you are having is in the snake, but caused by misunderstanding. TRS connections (Tip, Ring, Sleeve) are either balanced connections or stereo connections, but they can't be both. The TRS in this instance is carrying a mono balanced signal. To properly cable this up, you need to run a balanced signal for the left channel, and one for the right. In pro audio, to get a stereo image, it requires 2 channels.

So I've gone and gotten together two TRS cables, placed one in Line Out5 and one in Line Out 6, assigned the Assigned the two line outs as stereo and marked them as Cue mixes.

Both cables pass only the same side of audio.

The Channels are in stereo mode, clicking them in and out of Stereo/mono does nothing.

What am I missing now ?

I would have to see some screen shots of your setup. Did you hard pan each channel L and R?