lots of sketches, not ordered yet

svn path=/trunk/; revision=4871

10 files changed, 964 insertions, 20 deletions

diff --git a/doc/tutorials/sound/01.hello_world.pd b/doc/tutorials/sound/01.hello_world.pd
index 0aed8828..c5e23a12 100644
--- a/doc/tutorials/sound/01.hello_world.pd
+++ b/doc/tutorials/sound/01.hello_world.pd
@@ -3,19 +3,15 @@
 #X obj 533 20 pddp/dsp;
 #X obj 8 10 cnv 15 400 40 empty empty hello_world 20 12 0 24 -228992
 -66577 0;
-#X obj 198 136 comment 400 14 Helvetica ? 0 0 0 0 2 create an object
-called: osc~;
-#X obj 198 106 comment 400 14 Helvetica ? 0 0 0 0 1 create a message
-box with the text: 200;
-#X obj 198 166 comment 400 14 Helvetica ? 0 0 0 0 3 create an object
-called: dac~;
-#X obj 198 196 comment 400 14 Helvetica ? 0 0 0 0 4 connect the message
+#X text 198 136 2 create an object called: osc~;
+#X text 198 106 1 create a message box with the text: 200;
+#X text 198 166 3 create an object called: dac~;
+#X text 198 196 4 connect the message
 box to the osc~ object's left inlet;
-#X obj 198 226 comment 400 14 Helvetica ? 0 0 0 0 5 connect the osc~
+#X text 198 226 5 connect the osc~
 object to both inlets of the dac~ object;
-#X obj 198 256 comment 400 14 Helvetica ? 0 0 0 0 6 make sure your
-volume is set very low;
-#X obj 198 286 comment 400 14 Helvetica ? 0 0 0 0 7 turn on DSP by
+#X text 198 256 6 make sure your volume is set very low;
+#X text 198 286 7 turn on DSP by
 clicking the box on the upper right corner;
-#X obj 198 316 comment 400 14 Helvetica ? 0 0 0 0 8 click the message
+#X text 198 316 8 click the message
 box to hear sound;
diff --git a/doc/tutorials/sound/02.audio_data.pd b/doc/tutorials/sound/02.audio_data.pd
index ace535e6..1394c494 100644
--- a/doc/tutorials/sound/02.audio_data.pd
+++ b/doc/tutorials/sound/02.audio_data.pd
@@ -1,4 +1,4 @@
-#N canvas 15 58 624 444 10;
+#N canvas 393 46 628 448 10;
 #X obj 292 20 import cyclone;
 #X obj 236 244 *~;
 #X obj 253 217 tgl 15 0 empty empty empty 0 -6 0 8 -24198 -1 -1 0 1
@@ -10,15 +10,12 @@
 #X msg 200 142 125;
 #X obj 533 20 pddp/dsp;
 #X text 62 373 TODO: find out how to type ~ on various keyboards;
-#X obj 29 68 comment 400 12 Helvetica ? 0 0 0 0 For audio \, Pd has
-a specific data type. It is represented by tilde ("~") objects and
-thick cords.;
-#X obj 87 168 comment 200 12 Helvetica ? 0 0 0 0 messages (thin cord)
--->;
-#X obj 116 266 comment 200 12 Helvetica ? 0 0 0 0 audio (thick cord)
--->;
 #X obj 8 10 cnv 15 400 40 empty empty audio_data 20 12 0 24 -228992
 -66577 0;
+#X text 75 265 audio (thick cord) -->;
+#X text 49 164 messages (thin cord) -->;
+#X text 14 70 For audio \, pd has a specific data type. Audio objects
+all have a trailing tilde ("~"). Audio coords are thick.;
 #X connect 1 0 4 0;
 #X connect 1 0 4 1;
 #X connect 2 0 1 1;
diff --git a/doc/tutorials/sound/03.dsp_processing.pd b/doc/tutorials/sound/03.dsp_processing.pd
new file mode 100644
index 00000000..088a12e4
--- /dev/null
+++ b/doc/tutorials/sound/03.dsp_processing.pd
@@ -0,0 +1,42 @@
+#N canvas 406 233 640 460 10;
+#X obj 466 72 import pddp rradical;
+#X obj 541 21 pddp/dsp;
+#X obj 11 8 cnv 15 400 40 empty empty dsp_processing 20 12 0 24 -228992
+-66577 0;
+#X text 13 69 Unlike message processing \, which is always running
+\, audio processing can be switched on and off. This is also known
+as "DSP" or Digital Signal Processing.;
+#X text 12 122 There are many ways to control the DSP: There is a checkbox
+in the Pd window \; you can send Pd a dsp message \; there are key
+commands \; and there are high-level objects \, like [pddp/dsp].;
+#X text 15 189 The dsp message:;
+#X msg 28 238 \; pd dsp 0;
+#X msg 119 238 \; pd dsp 1;
+#X text 34 218 off (0);
+#X text 123 217 on (1);
+#X msg 218 238 \; pd dsp \$1;
+#X obj 218 214 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
+1;
+#X text 243 213 use a toggle;
+#X text 355 209 receive the message;
+#X obj 357 227 receive pd;
+#X obj 357 248 route dsp;
+#X obj 357 269 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
+1;
+#X text 22 303 Key commands:;
+#X text 57 328 GNU/Linux and Windows:;
+#X text 148 314 Mac OS X:;
+#X text 227 299 (off);
+#X text 328 300 (on);
+#X text 224 328 Ctrl-.;
+#X text 224 314 Cmd-.;
+#X text 324 328 Ctrl-/;
+#X text 324 314 Cmd-/;
+#X text 21 361 Objects:;
+#X text 55 383 [pddp/dsp];
+#X obj 132 383 pddp/dsp;
+#X obj 331 383 ezdac~;
+#X text 208 383 [rradical/ezdac~];
+#X connect 11 0 10 0;
+#X connect 14 0 15 0;
+#X connect 15 0 16 0;
diff --git a/doc/tutorials/sound/TEMPLATE.pd b/doc/tutorials/sound/TEMPLATE.pd
new file mode 100644
index 00000000..428ca231
--- /dev/null
+++ b/doc/tutorials/sound/TEMPLATE.pd
@@ -0,0 +1,6 @@
+#N canvas 286 169 640 460 10;
+#X obj 541 21 pddp/dsp;
+#X obj 11 8 cnv 15 400 40 empty empty TEMPLATE 20 12 0 24 -228992 -66577
+0;
+#X obj 151 364 ezdac~;
+#X obj 494 57 import rradical;
diff --git a/doc/tutorials/sound/TODO b/doc/tutorials/sound/TODO
new file mode 100644
index 00000000..bf5abbec
--- /dev/null
+++ b/doc/tutorials/sound/TODO
@@ -0,0 +1,61 @@
+
+- replace [comment] with #X text
+
+- wavetable
+  - link to playnow/draw_sound
+
+- Load a sound file (high-level, no tables, no soundfiler)
+
+- Play sound file back with phasor~?
+
+- Scrub sound file with numberbox
+
+- Create sound (high-level FM abstraction?)
+
+- Change sound quality with numberbox
+
+
+File Order:
+
+- hello world
+    quick sine wave patch
+- audio data
+    differences between audio and message data
+- dsp processing
+    controlling the DSP
+- oscillators
+    [osc~], [cos~], [phasor~]
+- amplitude modulation
+    super simple AM
+- AM synthesis
+    nice AM example
+- frequency modulation
+- FM synthesis  
+    (80's keyboard sound!)
+- click
+    graph click and play it
+	 a click contains all frequencies
+- ramping up and down
+    [line~], [line]
+- 3.audio.examples/A04.line2.pd
+- filtering
+    removing audio by frequency
+	 working in the frequency domain rather than amplitude
+- filter types 
+    lowpass, highpass, bandpass, bandreject/notch
+- filter order
+- filter shapes
+- resonant frequency
+- filter Q
+- equalizer
+- reverb (rev1, rev2, freeverb~)
+- feedback delay network reverb (fbn~)
+- convolution reverb (partconv~)
+
+
+
+digital audio tutorial
+- digital audio
+    samples represent the amplitude at the slice of time
+- aliasing
+- the samples 
diff --git a/doc/tutorials/sound/amplitude_modulation.pd b/doc/tutorials/sound/amplitude_modulation.pd
new file mode 100644
index 00000000..cb898b26
--- /dev/null
+++ b/doc/tutorials/sound/amplitude_modulation.pd
@@ -0,0 +1,351 @@
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+#X obj 23 406 dac~;
+#N canvas 0 22 450 300 graph1 0;
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+#X obj 59 226 comment 200 12 Helvetica ? 0 0 0 0 The "modulating frequency"
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diff --git a/doc/tutorials/sound/crossfade.pd b/doc/tutorials/sound/crossfade.pd
new file mode 100644
index 00000000..b71961ca
--- /dev/null
+++ b/doc/tutorials/sound/crossfade.pd
@@ -0,0 +1,355 @@
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+#X text 21 61 crossfade between two sine waves;
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diff --git a/doc/tutorials/sound/detecting_pitch.pd b/doc/tutorials/sound/detecting_pitch.pd
new file mode 100644
index 00000000..3dacda20
--- /dev/null
+++ b/doc/tutorials/sound/detecting_pitch.pd
@@ -0,0 +1,34 @@
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+-66577 0;
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+#X text 28 121 Now its time to be the fool and start singing into the
+mic!;
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+-1;
+#X text 152 223 <-- banged on attack;
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+#X obj 516 59 import rradical;
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diff --git a/doc/tutorials/sound/ramping_up_and_down.pd b/doc/tutorials/sound/ramping_up_and_down.pd
new file mode 100644
index 00000000..ba9f85a1
--- /dev/null
+++ b/doc/tutorials/sound/ramping_up_and_down.pd
@@ -0,0 +1,43 @@
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+#X text 197 155 ramp to 1 in 100 ms;
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diff --git a/doc/tutorials/sound/voice_fm.pd b/doc/tutorials/sound/voice_fm.pd
new file mode 100644
index 00000000..a9f0e6a7
--- /dev/null
+++ b/doc/tutorials/sound/voice_fm.pd
@@ -0,0 +1,59 @@
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+#X text 17 60 sing into the mic to control the FM synthesizer;
+#X obj 195 437 pddp/pddplink http://en.wikipedia.org/wiki/Frequency_modulation_synthesis
+;
+#X text 86 437 For more info:;
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