You will learn what a signal is in a second, but you should know that outputting sound depends on this, so, if you are having problems with sound, check if this is on before anything else. The DSP you see here stands for Digital Signal Processing and, as the name says, signals will only be processed when this is on. When you open pd you will see a window where there's not much you can do. This is outside the scope of this tutorial. If something is not working, make some research on how to configure JACK in your system. When you play something on your MIDI keyboard, you should see things happening in the MIDI IN section. Click the buttons under TEST TONES and you should hear some sounds. Patchage showing both a MIDI keyboard and virtual keyboard connected up to Pure Data VMPK can also connect itself to pd in Edit→Midi Connections. You can use a software like Patchage to manage both JACK and ALSA connections. Remember that pd cannot receive JACK MIDI input, so use ALSA MIDI output in your controller (you can also use a2jmidid to be able to connect JACK and ALSA MIDI ports). If you don't have a MIDI controller, you can use some kind of virtual controller, like VMPK. You will also need a way to input MIDI to your patch. If JACK is already running, selecting Media→jack should be enough. I recommend using it with JACK, because then you will be able to have low latency and (if you wish) connect the audio output of your patch to additional processing outside pd before outputting to the speakers. To follow this tutorial you should have pd installed. In this tutorial we will focus on audio synthesis. It can be used to make algorithmic compositions, live performances, visual data representation, interaction with sensors and lots of other things. Pure Data (aka pd) is a visual programming language for creating interactive multimedia works. If you want in-depth stuff, there are some great sites on the internet. The objective is to get you started with the software in a kind of hands-on approach, doing something relatively useful, relatively quick. In this tutorial we're going to make a very simple synthesizer using Pure Data and learn its concepts and workflow along the way.
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