mysterious bonus-externs

I've just discovered some externals installed by Pluggo in the Pluggo
Support/bonus-externs subfolder.

While most of them do not have a corresponding help file, some have a
clear function and could be useful also for non-Pluggo patches. For
instance, hp1~ and hp3~ are high-pass filters. shapeshow is a tool to
help draw shapes inside buffers (for waveshaping?). wrap~ and fold~ are
quite obvious too.

Others objects remain more mysterious to me : atolf and lftoa, low,
crinkle~...

Is there a documentation for these objects somewhere?

Roald Baudoux
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Composer of electroacoustic art (acousmatic music, sound installations,
live electronics).
(http://robaublog.canalblog.com/)

Junior Lecturer for the Royal Conservatory of Music (Mons, Belgium).
(http://www.conservatoire-mons.be)

Journalist for "Les Cahiers de l'ACME-Audio Pro", Brussels.
(http://www.cahiersacme.com)
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