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diff --git a/pd/doc/5.reference/acoustics~.pd b/pd/doc/5.reference/acoustics~.pd
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+#X obj 697 58 loadbang;
+#X msg 709 88 \; pd dsp 1;
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+#X text 70 11 (etc) - conversions for audio signals;
+#X text 60 400 see also:;
+#X obj 145 400 mtof;
+#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
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+#X text 41 343 Boundary conditions are handled "reasonably". 100 db
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