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That's one big difference between the circuit shown in that schematic and the one contained in the Folcrom. Switches are necessary if you ever want to vary the number of channels in use or their assignments to the left and/or right busses. Otherwise, leaving unused channels floating will affect the remaining channels in use. When you start adding switches, the parts cost and difficulty of assembly start to go way up. Without them, the usability of the circuit is severely limited. If one person is going to use it one way all the time for their own specific needs, this isn't a problem - just build it how you're going to use it. If your plans change though, you'll have to get out the soldering iron and rework it.
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