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05_Envelopes - L aboratory 5 Creating an envelope Think...

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Laboratory 5 Creating an envelope Think about what happens when you turn down the volume on your stereo (or ipod or computer). The overall amplitude of the sound changes, but the amplitudes within the sound relative to each other stay the same. This is a process that is called scaling. If, say, you want to have the amplitude of your sound change from no sound, a value of zero meaning no sound, and an amplitude of one, which in Pd is full volume, you can use multiplication. The values in the audio signal at any moment are values ranging between -1 and 1. When we multiply those values by numbers that change gradually from a value of zero to the value of 1, the audio signal amplitude numbers will move from zero up to their full value. The result, if looked at in a picture would look something like the following: or (for a more complex waveform) In this lab we will learn about four new objects: Bang , *~, line~ and delay . You can bring up the documentation on any of these objects by going to the <Help> menu, bringing up the <Browser>, then click <5. Reference>. If you scroll down, you will find listings of all of Pd's objects. When you double click on any of them, a window will open with a description which is sometimes helpful, but sometimes is obscure, telling you how to use the object. The more you work with Pd, the easier it will be to understand these explanations. You can also get more step by step help and examples by opening up examples in other parts of the browser, such as <3.audio.examples> <A003.line.pd>. First there is the "Bang" object. It has its own line in the <Put> menu.
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When you select <Bang> you will create an object that looks like a circle with a square around it. It behaves like a button. When you click on it in run mode it sends the "bang" message through its outlet. Many objects will respond to a "bang" message by performing an action. In run mode, when <Message> objects receive a "bang", they will send their message through
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