There's probably a line most people would draw between what defines an instrument in its strictest of terms, and what could be used to facilitate an instrument. If we didn't, then we could call air an instrument because it facilitates the transmission of vibrations, on which the function of musical instruments rely.
I would go with Janszoon's statement about the software being the instrument. It seems more accurate than calling the computer itself an instrument. Or the power cable. Or the room it's sitting in...
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