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The Indigo is a Type II CardBus PCMCIA add-on sound card that can be installed in one of the card slots in your current notebook. Once the Indigo is installed, you will have true 24-bit, 96kHz audio, with high quality digital to analog converters and a Motorola DSP. Best of all, once you plug in your headphones, you hear beautiful silence, with no hissing or buzzing to detract from the audio quality.
Full story and source here
Full story and source here