Get highest / lowest not FL Piano Roll

highlow.py

import flpianoroll as flp
import math

PPQ = flp.score.PPQ
BEAT = PPQ * 4
STEP = PPQ
SCAN_UNITS_STR = ['Tick', 'Half Beat', 'Odd Beat', 'Half Bar', 'Odd Bar']
SCAN_UNITS = [1, STEP * 2, PPQ, PPQ * 2, BEAT]


if flp.score.noteCount == 0:
    flp.Utils.ShowMessage("There are no notes!")
else:
	def createDialog():
		"""Create a dialog to select note criteria."""
		Form = flp.ScriptDialog("Select Highest or Lowest Note", "")
		Form.AddInputCombo("Select note", "Highest, Lowest, Middle", 0)
		Form.AddInputCheckbox("Ignore singles", True)
		Form.AddInputCombo("Scan at each", [unit_str for unit_str, unit in zip(SCAN_UNITS_STR, SCAN_UNITS) if unit < flp.score.length], 0)
		return Form

	def apply(dialog):
		"""Apply the selected note criteria."""
		notes_starts = [flp.score.getNote(i).time for i in range(flp.score.noteCount)]
		notes_ends = [note_start + flp.score.getNote(i).length - 1 if flp.score.getNote(i).length > 0 else note_start for i, note_start in enumerate(notes_starts)]

		scan_unit = SCAN_UNITS[dialog.GetInputValue("Scan at each")]
		num_of_scans = math.ceil((flp.score.length / scan_unit) / 2)

		ignore_singles = dialog.GetInputValue("Ignore singles")
		select_note = dialog.GetInputValue("Select note")

		for scan_index in range(num_of_scans):
			t = (((scan_index + 1) * 2) - 1) * scan_unit if scan_unit > 0 else scan_index  # Calculate current time
			notes_in_scan = [i for i, (start, end) in enumerate(zip(notes_starts, notes_ends)) if start <= t <= end]

			if len(notes_in_scan) < 2 and ignore_singles:
				continue

			notes_numbers = [flp.score.getNote(i).number for i in notes_in_scan]
			if notes_numbers:
				max_note_index = notes_in_scan[notes_numbers.index(max(notes_numbers))]
				min_note_index = notes_in_scan[notes_numbers.index(min(notes_numbers))]

				if select_note == 0:  # Highest
					flp.score.getNote(max_note_index).selected = True
				elif select_note == 1:  # Lowest
					flp.score.getNote(min_note_index).selected = True
				else:  # Middle (doesn't work all the time)
					flp.score.getNote(max_note_index).selected = False
					flp.score.getNote(min_note_index).selected = False
					if max_note_index == min_note_index and not ignore_singles:
						flp.score.getNote(min_note_index).selected = True