See the issue here is where the music is mixed at. When you have existing tracks, and are adding new tracks then have to cross paths somewhere. And every road they take requires time. If you play the guitar into a line or mike input, it take time for the music to pass thru the AD/DA convertors, and reach tha program, and while that is happening the music in the existing tracks has already headed to the exit to hit the speakers. That means going out of the sound card. So the incoming guitar has to go from the input to the convertors and to the software a be recorded and exit back to the sound card and out. All the existing tracks have to do is the output, so the new tracks need to travel twice as far.

A good interface will use it's driver setup to allow all this to happen at it's software mixer, an internal program that is written into that driver. This introduces compensation to the process and allow them to meet and sort of catch up, and you and the speakers hear them all at the same time.

Built in cards do not have drivers that are really capable of this type of process. You can use third party drivers like ASIO4All, and others, but it is a piece of duct tape on the problem. A solid recording interface or sound card with drivers written for this becomes the heart and soul of the system.

John's horse just can't keep up!!!

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