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The majority of synthesizers and electronic organs have a central brain called a microprocessor. This is a tiny computer, but the synthesizer’s controls are designed so that you do not have to know anything about computers in order to operate the keyboard. This is because the microprocessor has been told, by means of a control program, exactly what to do in response to how you set the instrument’s controls and play the keys. It scans the keyboard and the controls, and sends signals to the relevant parts of the instrument, telling it what to do.
Everybody these days now have access to a personal computer, and these devices can be used for music-making. Unlike the microprocessor in a synthesizer, a personal computer is not a dedicated device. It can perform many tasks, from doing accounts to making sounds, but it can only do these things if you give it the right instructions. These instructions are known as programs, and they need to be fed to the computer before it can make any sense of any further information you want to give it.
To be able to process good sound effects and download good synthesizer sounds and programs, you need a well equipped and up to date computer with lots of memory and RAM. If your current computer is not being used because it broke down sometime ago, and buying a new computer is beyond your current budget. A good computer repair and upgrade is enough to be able to get back in producing creative quality sounds.