The IN’s and OUT’s of MIDI have a useful article aimed primarily at the beginning home/amateur musician who wants to understand MIDI and audio setups, and get a few MIDI synths and PC connected together.

Though it’s entitled The In’s and Out’s of MIDI it actually covers other principles such as PC cards, audio mixers, connection cables, and sequencing software.

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It’s not an exhaustive introduction to MIDI but it’s a useful ‘hands-on’ guide to setting up a basic home studio, and there’s a link to a fairly active forum on the topic as well.