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#X text 37 47 INLETS:;
#X obj 54 18 swap;
#X text 108 18 - SWAP TWO NUMBERS \, RESPECTING RIGHT-TO-LEFT ORDER
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#X obj 285 470 swap;
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#X msg 454 436 bang;
#X obj 454 460 swap 12;
#X text 37 62 - LEFT:;
#X text 28 263 - RIGHT:;
#X text 104 63 Float - A float at the left inlet will send the number
to the right outlet and then send the number at the right inlet to
the left outlet.;
#X text 104 117 Bang - A bang at the left inlet will force [swap] to
send its values to the outlets \, in reverse order. The value from
the left inlet will be sent to the right outlet then the value at the
right inlet will be sent out the left outlet.;
#X text 104 188 List - A list at the left inlet will update the values
of both of [swap]'s inlets and send the numbers to the outlets in reverse
order. Note that lists of 3 or more elements will be truncated.;
#X text 104 264 Float - A float at the right inlet is stored for later
use. It will be sent to the left outlet when a float or bang is received
in the left inlet.;
#X text 104 317 One - [swap] accepts a single float as a creation argument
which initializes the first value to be sent out the left outlet.;
#X text 104 370 Two - outputs the float values of the two inlets in
reverse order when a float \, list \, or bang is received at the left
inlet.;
#X text 371 418 float;
#X text 174 410 float;
#X text 244 409 list;
#X text 428 510 creation argument;
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#X text 30 126 [split];
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#N canvas 154 0 649 595 millers_note-off_parser 0;
#X obj 27 18 notein;
#X text 103 14 [notein] is an object which receives incoming MIDI data
from a MIDI instrument. The three outlets are PITCH \, VELOCITY \,
and MIDI CHANNEL from left to right. It is important to note however
that the data is outputted from right to left. Which means that the
first piece of information to be sent out the object is the MIDI CHANNEL.
;
#X obj 26 117 swap;
#X obj 26 156 pack;
#X obj 26 200 route 0;
#X floatatom 26 228 5 0 0 0 - - -;
#X text 102 117 Here \, [swap] is used to store the VELOCITY until
the PITCH information comes from [notein]. The next step will pack
the two together...but we have to ensure that [pack] receives the two
numbers in the correct order: PITCH first \, then VELOCITY. This way
\, using [route] we can determine whether or not this incoming MIDI
data is a "note-off" signal (i.e. VELOCITY = 0).;
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#X text 122 308 The goal of the Miller's example at the bottom left
\, is to retrieve "note-off" signals from [notein]. To do that \, we
have to test the incoming data for pitches with a velocity of zero.
To do that \, we are packing up the incoming PITCH and VELOCITY data
and sending them to [route]...in effect we achieve the following:;
#X text 98 420 IF velocity = 0 THEN "bang";
#X text 127 445 In the example above \, the [pack] object will output
a list as soon as the VELOCITY information comes from [notein]. As
a result \, the list will be outputted from pack BEFORE the PITCH information
is retrieved. [swap] is used to solve this problem by making sure that
the VELOCITY and PITCH are both received before packing them up and
sending them to the [route] object.;
#X text 50 248 This will "bang" only when velocity = 0;
#X text 22 282 THIS IS WHY THE ALTERNATIVE DOESN'T WORK?;
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#X restore 28 569 pd millers_note-off_parser;
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#X obj 43 289 unpack f f f f;
#X floatatom 193 319 5 0 0 0 - - -;
#X text 14 10 [swap] is most commonly used to change the order of a
list. This trick is best suited for a PAIR of numbers.;
#X obj 166 345 swap;
#X obj 139 370 swap;
#X obj 112 394 swap;
#X obj 196 378 swap;
#X obj 169 403 swap;
#X obj 228 408 swap;
#X floatatom 262 440 5 0 0 0 - - -;
#X text 230 345 This could quickly become ridiculous!;
#X msg 165 245 1 2 3 4;
#X msg 254 258 0 200 3333 1111;
#X text 14 477 In other settings \, the [swap] object is useful as
a timing mechanism to ensure that two numbers arrive at their destination
in a particular order. Miller Puckette provided an excellent example
of [swap] used to build a 'note-off parser'.;
#X text 14 185 Lists that are longer than two elements could be sorted
this way \, but the structure quickly becomes unmanageable. It's probably
better to find an alternative method.;
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#X restore 104 547 pd More_Info;
#X text 152 573 - Dave Sabine \, November 12 \, 2002;
#X text 13 317 ARGUMENTS:;
#X text 29 369 OUTLETS:;
#X text 20 427 EXAMPLES:;
#X text 21 522 SEE ALSO:;
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