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There has to be a reason why it's 128. 128 is a crucial number in MIDI too? 128 general midi instruments, volumes with 128 sliding points?
God knows! But there must be a reason why 128 is the limit!
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The answer is here:
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It is not unusual, owing to the binary nature of the switches which form the circuitry of the hardware, for such limitations be some multiple of 2, particularly 2 raised to a certain power. In this case, 128 equals 2 to the 7th power.
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Maybe it's because I've been using computers for so long, and numbers seem to stick in my brain, but think about progressions we've heard in computing, especially in processor power, memory chip capacity, hard drive capacity, etc. Numbers like 64, 128, 256, 512, 1024, etc etc etc keep popping up all over the place. The software runs the hardware, and though it's hardware the likes of which none of us has seen, that's what Google basically is-- a bunch of software running a bunch of hardware. Midi instruments are hardware being run by software too.