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/usr/share/puredata/doc/5.reference/acoustics~-help.pd is in puredata-core 0.46.7-3.

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#X text 70 11 (etc) - conversions for audio signals;
#X text 60 400 see also:;
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#X text 192 400 (etc.);
#X text 547 416 updated for Pd version 0.33;
#X text 43 241 These objects convert MIDI pitch to frequency and back
\, and dB to and from RMS and power. THey take audio signals as input
and output (and work sample by sample.) Since they call library math
functions \, they may be much more expensive than other workaday tilde
objects such as *~ and osc~ \, depending on your hardware and math
library.;
#X text 41 343 Boundary conditions are handled "reasonably". 100 db
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