Digital Mixers:
A digital mixer works basically the same as an analog mixer, except that the
audio is converted to a digital signal at the connector and most functions on
the mixer are controlled by internal digital processors.

Signal Processing:
Outboard signal processing is best reserved to those who understand audio and
how it can be manipulated. These devices require the use of a mixer and are
usually placed between the mixer and the USB interface. It is important to know
that once processed, an audio signal cannot be "unprocessed."
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