How do I use one audio jack as input and one as output?

On my MacBook Pro, if I get a USB-headphone connector (to add another audio port), will I be able to set one audio port as input and the other as output? To use the port coming out of the USB jack as a headphone jack, and plug a mic/output device into the computer's port?
I'm thinking about buying a "Sabrent USB External Stereo Sound Adapter". I have a preamp that is NOT an interface, and I want to be able to monitor what I'm doing so I can multitrack. But my MacBook only having one audio 1/8 inch jack makes it so I have to choose either input OR output...I'm hoping if I add an extra port via USB I'll be able to have one of each.
Thank you!

Roger Wilmut1 wrote:
nategm wrote:
On my MacBook Pro, if I get a USB-headphone connector (to add another audio port), will I be able to set one audio port as input and the other as output?
Yes, either way round. In System Preferences>Sound you can set the input and output ports separately.
Roger, the System setting have -Nothing- to do with the question being asked. Do you use Logic Pro audio software? If you did you would know Logic has it's own audio settings that run independently from the System audio. There's also the fact that Maverick has problems with "some" older USB 2.0 audio hardware. Basically, this is not a slam-dunk, that's why I suggested asking someone if they've used this combination before. Although... the USB audio device is cheap ($10) it might be worth it to try. Still.............**
** I question the wisdom of using cheap audio hardware on a computer that cost $1000+, software that costs $200 and then using the internal audio chip ($2) and an external monitoring device that costs $10. Defeats the whole purpose of using professional audio software.

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