MIDI controls only use 7 bits, which is why the max value is 127. But they are still transmitted as 8 bit bytes, just with the highest bit always set to 0. Some controls use two bytes together to provide 14 bit values up to 16,383, or +/- 8192 in the case of pitch bend.
Analog 4 has digital controls which must get converted to CV internally at some point through a DAC, but from what I’ve seen the encoder resolution is much larger than MIDI, so ‘zipper noise’ as it used to be called, is minimised.
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