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These symbols and diacritics (modifiers) are taken from the International Phonetic Alphabet - except that there are some things which aren't even covered by the IPA! (The main one is the techno swallow.) So here are the extra Unicode symbols I've added:
^ at the start means the sound is inhaled rather than exhaled
[ indicates side-ness (for click rolls and for inhaling bass drum)
⊙ for the 808 kick / "techno swallow"
※ for the kissy-kissy hat
⁁ for vocal tap
« for palatal trills
§ for tongue-pop
Where a sound has more than one entry, each one is a slightly different way of making the sound.
If most of the symbols just look like little squares to you, then you're either using an old browser (earlier than v4 of Internet Explorer or Netscape) or you don't have any Unicode fonts installed. See this page for help.
"bm - ts bm kl bm tkt bm kl bm tt̚ bʍ kl - tʃʍʂ bm"
This is an eight-bar pattern. (Every measure is separated by a space, and every silent measure is written as a dash.)