ESI GIGAPort DG - Manual (Page 27)

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This control panel is pretty simple.
However you should be careful with ‘System performance’ in Dithering menu.
You can choose the bit-rate of your recordings in ‘Recording resolution’.
If you have music file recorded 24bit and you're going to play it back via
GIGAport's 16bit, you have to select ‘24bit’ on Recording Resolution. In this case,
you can use dithering to increase quality.
Also, you can choose four different system performance depends on your
computer’s efficiency.
Choosing ‘Highspeed’ and ‘Faster’ will bring fast processing.
But if your computer has low efficiency and you select ‘Highspeed’, it cause noise
problem. We generally recommend to you to select ‘Fast’ or ‘normal’.