Logic “Select Highest / Lowest Note” function - Cubase equivalent?

No…

With the midi file you provided, and a polyphonic staff, Explode reassigns the notes’ channels according to the lines.

One workflow, assuming your have set the midi part in Score Edit to polyphonic display, would be to:

  • open the part in a score editor edit view, explode to voices
  • switch to a key editor
  • Use the Logical editor to select all notes in the channel, eg., the top voice will be in channel 1

do your edits.

This can even be done using a macro to perform the commands.

Here’s a gif of what happens:
video of macro working.gif

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