Identical consecutive voicings should be penalized

[napulen]

It is common to find progressions where the same roman numeral repeats itself:

I think in these cases, a common procedure for "good" voice leading is to prefer a change of the voicing (e.g., change of position in the three upper voices), penalizing the algorithm for proposing the exact same voicing twice.

I wanted to make sure that the policy coincides with the practice in existing music.

I looked for repeated harmonies like these in 69 annotated Bach Chorales and found 192 instances.

Out of those 192 instances:

• In 78% of them, the voicing changes
• In 22% of them, the voicing remains the same

Here are a few of the instances I found. Red means different voicing and green means same voicing.

For completeness, here is the full table. Offsets are given in quarter notes from the beginning of the score (starting from 0.0). In all instances, chord1 and chord2 are contiguous and annotated by a human expert:

file	chord1_offset	chord1_notes	chord2_offset	chord2_notes	same_voicing?
chor315.krn
	5.0	['B4', 'G4', 'D4', 'G2']	8.0	['B4', 'G4', 'D4', 'G2']	True
chor001.krn
	0.0	['G4', 'D4', 'B3', 'G2']	1.0	['G4', 'D4', 'B3', 'G3']	False
	19.0	['G4', 'D4', 'B3', 'G2']	21.0	['B4', 'G4', 'D4', 'G2']	False
	21.0	['B4', 'G4', 'D4', 'G2']	22.0	['B4', 'G4', 'D4', 'G2']	True
	24.0	['D5', 'G4', 'B3', 'B2']	25.0	['D5', 'G4', 'B3', 'B2']	True
	30.0	['G4', 'E4', 'B3', 'E3']	31.0	['B4', 'E4', 'G3', 'E3']	False
chor024.krn
	0.0	['D4', 'A3', 'F#3', 'D3']	1.0	['A4', 'D4', 'F#3', 'D3']	False
	6.0	['D5', 'F#4', 'A3', 'D3']	7.0	['D5', 'F#4', 'A3', 'D2']	False
	7.0	['D5', 'F#4', 'A3', 'D2']	8.0	['F#5', 'A4', 'A4', 'D4']	False
	13.0	['D5', 'A4', 'F#4', 'D3']	16.0	['D5', 'A4', 'F#4', 'D3']	True
	16.0	['D5', 'A4', 'F#4', 'D3']	17.0	['F#5', 'D5', 'A4', 'D4']	False
chor050.krn
	7.0	['A4', 'F4', 'C4', 'F3']	8.0	['A4', 'F4', 'C4', 'F3']	True
	9.0	['C5', 'F4', 'C4', 'A3']	10.0	['C5', 'F4', 'C4', 'A2']	False
	33.0	['C5', 'F4', 'C4', 'A3']	34.0	['C5', 'F4', 'C4', 'A3']	True
chor323.krn
	31.0	['A4', 'F4', 'C4', 'F2']	33.0	['A4', 'F4', 'C4', 'F2']	True
chor176.krn
	0.0	['F4', 'C4', 'A3', 'F2']	1.0	['F4', 'C4', 'A3', 'F3']	False
	16.0	['C5', 'G4', 'C4', 'E3']	17.0	['C5', 'E3', 'G4', 'E4']	False
	19.0	['A4', 'G4', 'D4', 'D3']	20.0	['A4', 'D3', 'F4', 'A3']	False
	25.0	['C5', 'E4', 'A3', 'A3']	26.0	['C5', 'E4', 'C4', 'A3']	False
	34.0	['F4', 'A3', 'F3', 'D3']	36.0	['F4', 'D4', 'A3', 'D3']	False
chor200.krn
	12.0	['G4', 'D4', 'B-3', 'G2']	14.0	['G4', 'D4', 'B-3', 'G3']	False
	28.0	['C5', 'A4', 'F4', 'F3']	29.0	['C5', 'A4', 'F4', 'F3']	True
	48.0	['D5', 'B-4', 'F4', 'B-2']	50.0	['D5', 'B-4', 'F4', 'B-3']	False
chor311.krn
	7.0	['A4', 'F4', 'C4', 'F3']	8.0	['A4', 'F4', 'C4', 'F3']	True
chor019.krn
	0.0	['G4', 'D4', 'B-3', 'G3']	1.0	['G4', 'D4', 'B-3', 'G3']	True
	7.0	['F#4', 'D4', 'A3', 'D3']	8.0	['F#4', 'D4', 'A3', 'D3']	True
	16.0	['A4', 'F4', 'C4', 'F3']	17.0	['A4', 'F4', 'C4', 'F3']	True
	23.0	['B-4', 'D4', 'B-3', 'G3']	24.0	['B-4', 'G4', 'D4', 'G2']	False
	27.0	['F#4', 'D4', 'A3', 'D3']	28.0	['F#4', 'D4', 'A3', 'D3']	True
	33.0	['F#4', 'D4', 'A3', 'D3']	34.0	['F#4', 'D4', 'A3', 'D2']	False
	35.0	['G4', 'D4', 'C4', 'G2']	35.5	['G4', 'D4', 'G2', 'B3']	False
chor136.krn
	0.0	['G4', 'D4', 'B3', 'G2']	1.0	['B4', 'G4', 'D4', 'G2']	False
chor303.krn
	13.0	['F4', 'C4', 'A3', 'F2']	16.0	['F4', 'C4', 'A3', 'F3']	False
chor248.krn
	9.0	['B4', 'G4', 'D4', 'G3']	10.0	['G3', 'G4', 'D4', 'B3']	False
chor028.krn
	6.0	['B4', 'D4', 'F#3', 'B2']	8.0	['B4', 'F#4', 'D4', 'B2']	False
	8.0	['B4', 'F#4', 'D4', 'B2']	9.0	['D5', 'F#4', 'B3', 'B3']	False
	22.0	['B4', 'F#4', 'D4', 'B2']	24.0	['B4', 'F#4', 'D4', 'B3']	False
chor101.krn
	13.0	['B-4', 'F4', 'D4', 'B-2']	16.0	['B-4', 'F4', 'D4', 'B-2']	True
	16.0	['B-4', 'F4', 'D4', 'B-2']	17.0	['D5', 'B-4', 'F4', 'B-3']	False
chor255.krn
	1.0	['F#4', 'D4', 'A3', 'D3']	2.0	['D4', 'F#4', 'A3', 'D3']	False
	3.0	['A4', 'D4', 'A3', 'F#3']	4.0	['A4', 'A4', 'D4', 'F#3']	False
	5.0	['B4', 'G4', 'D4', 'G3']	8.0	['B4', 'D4', 'G3', 'G2']	False
	9.0	['E4', 'C#4', 'G3', 'A2']	10.0	['G3', 'E4', 'C#4', 'A2']	False
	13.0	['F#4', 'D4', 'A3', 'D3']	14.0	['D4', 'A3', 'F#3', 'D3']	False
	31.0	['A4', 'E4', 'C#4', 'A2']	32.0	['A4', 'E4', 'C#4', 'A2']	True
	33.0	['A4', 'F#4', 'D4', 'D3']	34.0	['A4', 'F#4', 'D4', 'D3']	True
	41.0	['B4', 'E4', 'G#3', 'E3']	42.0	['B4', 'E4', 'G#3', 'E3']	True
	59.0	['E4', 'D4', 'A3', 'A3']	60.0	['E4', 'C#4', 'A3', 'A2']	False
chor110.krn
	7.0	['C4', 'G3', 'E-3', 'C3']	8.0	['G4', 'E-4', 'C4', 'C4']	False
chor153.krn
	4.0	['A4', 'D4', 'E3', 'A2']	5.0	['A4', 'C#4', 'E3', 'A2']	False
	6.0	['F#4', 'D4', 'D3', 'D2']	7.0	['F#4', 'D4', 'D3', 'D2']	True
	7.0	['F#4', 'D4', 'D3', 'D2']	8.0	['A4', 'D4', 'F#3', 'D3']	False
	8.0	['A4', 'D4', 'F#3', 'D3']	9.0	['A4', 'D4', 'F#3', 'D3']	True
	16.0	['E4', 'C#4', 'A3', 'A2']	17.0	['E4', 'C#4', 'A3', 'A2']	True
	22.0	['A4', 'C#4', 'A3', 'A2']	23.0	['A2', 'A4', 'C#4', 'A3']	False
	30.0	['B4', 'D4', 'B3', 'B2']	31.0	['B3', 'B2', 'B4', 'D4']	False
	32.0	['F#4', 'D4', 'A3', 'D3']	33.0	['F#4', 'D4', 'A3', 'D3']	True
chor336.krn
chor224.krn
	0.0	['F4', 'C4', 'A3', 'F3']	1.0	['A4', 'F4', 'C4', 'F3']	False
	7.0	['A4', 'C4', 'F3', 'F3']	8.0	['F4', 'C4', 'A3', 'F3']	False
	8.0	['F4', 'C4', 'A3', 'F3']	9.0	['C5', 'F4', 'A3', 'F3']	False
chor164.krn
chor191.krn
	0.0	['E4', 'C4', 'A3', 'A2']	1.0	['A4', 'E4', 'C4', 'A3']	False
	13.0	['E4', 'C4', 'A3', 'A2']	16.0	['E5', 'A4', 'C4', 'A3']	False
	31.0	['B4', 'D4', 'G3', 'G2']	32.0	['B4', 'G4', 'D4', 'G3']	False
chor040.krn
	19.0	['D5', 'G4', 'B3', 'G3']	20.0	['D5', 'G4', 'B3', 'G3']	True
chor361.krn
	16.0	['A4', 'F#4', 'D4', 'D3']	17.0	['A4', 'A4', 'F#4', 'D4']	False
chor213.krn
	10.0	['F4', 'C4', 'A3', 'F2']	12.0	['A4', 'F4', 'C4', 'F3']	False
chor282.krn
	14.0	['C5', 'G4', 'E4', 'C3']	16.0	['E5', 'G4', 'C4', 'C4']	False
	32.0	['E5', 'G4', 'C4', 'C4']	33.0	['G5', 'C5', 'E4', 'C3']	False
chor345.krn
	7.0	['E4', 'B3', 'G#3', 'E3']	8.0	['B4', 'E4', 'G#3', 'E3']	False
	13.0	['A4', 'E4', 'C4', 'A2']	16.0	['C5', 'A4', 'E4', 'A3']	False
	22.0	['C5', 'E4', 'G3', 'C3']	23.0	['C5', 'E4', 'G3', 'C3']	True
	23.0	['C5', 'E4', 'G3', 'C3']	24.0	['G4', 'E4', 'C4', 'C3']	False
	33.0	['B4', 'D4', 'G3', 'G3']	34.0	['D5', 'G4', 'B3', 'G3']	False
chor067.krn
	14.0	['G4', 'B3', 'D3', 'G2']	16.0	['B4', 'G4', 'D4', 'G2']	False
	24.0	['D5', 'D4', 'G3', 'B2']	25.0	['D5', 'G4', 'B3', 'G2']	False
	32.0	['B4', 'G4', 'D4', 'G3']	33.0	['D5', 'G4', 'B3', 'G2']	False
	40.0	['G4', 'E4', 'E3', 'E2']	42.0	['B4', 'E4', 'G3', 'E3']	False
chor366.krn
	7.0	['C#5', 'E4', 'A3', 'A2']	8.0	['C#5', 'A4', 'E4', 'A3']	False
	9.0	['E5', 'A4', 'E4', 'C#4']	10.0	['E5', 'A4', 'E4', 'C#3']	False
	15.0	['G#4', 'E4', 'B3', 'E3']	16.0	['E4', 'B3', 'G#3', 'E3']	False
	27.0	['C#5', 'E4', 'A3', 'A3']	28.0	['E5', 'C#4', 'A3', 'A3']	False
	43.0	['C#5', 'A3', 'E3', 'C#3']	44.0	['E3', 'E5', 'A4', 'C#3']	False
chor268.krn
	7.0	['E5', 'G4', 'C4', 'C3']	8.0	['E5', 'G4', 'C4', 'C3']	True
	8.0	['E5', 'G4', 'C4', 'C3']	9.0	['E5', 'G4', 'E4', 'C4']	False
	15.0	['C5', 'E4', 'G3', 'C3']	16.0	['C5', 'E4', 'G3', 'C3']	True
	23.0	['A4', 'E4', 'C4', 'A2']	24.0	['A4', 'E4', 'C4', 'A3']	False
	29.0	['G4', 'D4', 'B3', 'G2']	30.0	['G4', 'D4', 'B3', 'G3']	False
	39.0	['F5', 'F4', 'D4', 'D3']	40.0	['F5', 'A4', 'F4', 'D4']	False
	57.0	['G4', 'D4', 'B3', 'G2']	58.0	['G4', 'D4', 'B3', 'G2']	True
chor354.krn
	9.0	['B4', 'G4', 'D4', 'G3']	10.0	['G3', 'G4', 'D4', 'B3']	False
chor276.krn
	3.0	['D5', 'G4', 'B3', 'G3']	4.0	['D5', 'G4', 'G3', 'B3']	False
	13.0	['D5', 'D4', 'F#4', 'D3']	16.0	['D5', 'F#4', 'D4', 'D3']	False
chor339.krn
	23.0	['E5', 'C5', 'C4', 'E3']	24.0	['E5', 'C5', 'E4', 'C3']	False
	27.0	['C5', 'G4', 'E4', 'C3']	28.0	['E5', 'G4', 'C4', 'C3']	False
chor299.krn
	4.0	['D5', 'A-4', 'F4', 'B-3']	5.0	['D5', 'A-4', 'F4', 'B-2']	False
	10.0	['E-5', 'G4', 'D4', 'C3']	11.0	['G4', 'E-5', 'C4', 'E-3']	False
	14.0	['C5', 'F4', 'B-3', 'F3']	15.0	['C5', 'F4', 'A3', 'F2']	False
	34.0	['E-4', 'B-3', 'G3', 'E-3']	36.0	['B-4', 'G4', 'E-4', 'E-4']	False
	41.0	['D5', 'G4', 'D4', 'B2']	41.5	['G4', 'E-5', 'B3', 'G2']	False
chor048.krn
	2.0	['C5', 'E4', 'A3', 'A3']	3.0	['C5', 'E4', 'A3', 'A2']	False
	3.0	['C5', 'E4', 'A3', 'A2']	4.0	['C5', 'E4', 'A3', 'A3']	False
	6.0	['E5', 'G4', 'C4', 'C4']	7.0	['E5', 'G4', 'C4', 'C3']	False
	7.0	['E5', 'G4', 'C4', 'C3']	8.0	['E5', 'G4', 'C4', 'C4']	False
	14.0	['A4', 'E4', 'C#4', 'A2']	16.0	['E5', 'A4', 'C#4', 'A3']	False
	22.0	['E5', 'G4', 'D4', 'D3']	23.0	['D5', 'F#4', 'A3', 'D3']	False
	30.0	['C5', 'F4', 'C4', 'C3']	31.0	['C5', 'E4', 'G3', 'C3']	False
	38.0	['A4', 'D4', 'A3', 'A3']	39.0	['A4', 'C#4', 'E3', 'A2']	False
chor306.krn
	4.0	['D4', 'E-4', 'G3', 'C3']	5.0	['G4', 'E-4', 'C4', 'C3']	False
	7.0	['B-4', 'D4', 'G3', 'G2']	8.0	['B-4', 'G4', 'D4', 'G3']	False
	12.0	['E-4', 'C4', 'G3', 'C3']	13.0	['G4', 'E-4', 'C4', 'C3']	False
	23.0	['E-4', 'B-3', 'G3', 'E-2']	24.0	['E-5', 'B-4', 'G3', 'E-2']	False
	40.0	['G4', 'E-4', 'B-3', 'E-3']	41.0	['B-4', 'G4', 'E-4', 'E-3']	False
	55.0	['F4', 'E-4', 'B-3', 'B-2']	56.0	['B-4', 'F4', 'D4', 'B-3']	False
chor281.krn
	0.0	['G4', 'D4', 'B-3', 'G2']	1.0	['G4', 'D4', 'B-3', 'G3']	False
	31.0	['B-4', 'F4', 'D4', 'B-2']	32.0	['D5', 'B-4', 'F4', 'B-3']	False
chor273.krn
	15.0	['D4', 'A3', 'F#3', 'D3']	16.0	['D4', 'D4', 'F#3', 'D3']	False
chor305.krn
	30.0	['F#4', 'D4', 'A3', 'D3']	32.0	['F#4', 'D4', 'A3', 'D3']	True
	34.0	['E4', 'C#4', 'A3', 'A3']	35.0	['E4', 'C#4', 'A3', 'A3']	True
chor158.krn
	15.0	['G4', 'D4', 'B3', 'G2']	16.0	['G4', 'D4', 'B3', 'G3']	False
	57.0	['E4', 'C4', 'G3', 'C3']	58.0	['C3', 'C4', 'G3', 'E3']	False
chor054.krn
chor098.krn
	11.0	['C#5', 'F#4', 'B3', 'F#3']	12.0	['C#5', 'F#4', 'A#3', 'F#2']	False
	13.0	['B4', 'D4', 'B3', 'B2']	16.0	['D5', 'B4', 'F#4', 'B3']	False
	22.0	['D5', 'D3', 'F#4', 'A3']	23.0	['D5', 'F#4', 'A3', 'D3']	False
	23.0	['D5', 'F#4', 'A3', 'D3']	24.0	['A4', 'F#4', 'D4', 'D3']	False
chor368.krn
	24.0	['G4', 'E4', 'C4', 'C3']	27.0	['E5', 'G4', 'C4', 'C3']	False
	45.0	['G5', 'G4', 'C4', 'E3']	46.0	['C4', 'C5', 'G4', 'E3']	False
	49.0	['F3', 'D5', 'B-3', 'B-2']	50.0	['B-2', 'B-4', 'F4', 'D4']	False
	51.0	['G4', 'F4', 'G3', 'C3']	52.0	['G4', 'E4', 'C4', 'C3']	False
chor009.krn
	16.0	['A4', 'F#4', 'D4', 'D3']	17.0	['A4', 'A4', 'F#4', 'D4']	False
chor069.krn
	19.0	['G4', 'D4', 'B3', 'G2']	20.0	['G4', 'D4', 'B3', 'G3']	False
	24.0	['D5', 'F#4', 'A3', 'F#3']	25.0	['D5', 'F#4', 'A3', 'F#3']	True
	35.0	['B4', 'G4', 'D4', 'G2']	36.0	['G4', 'D5', 'B3', 'G3']	False
	61.0	['A4', 'E4', 'C4', 'A2']	62.0	['C5', 'E4', 'A3', 'A3']	False
chor258.krn
	33.0	['D5', 'G4', 'D4', 'B2']	34.0	['B2', 'D5', 'G4', 'B3']	False
chor157.krn
	15.0	['F4', 'C4', 'A3', 'F2']	16.0	['C5', 'F4', 'A3', 'F3']	False
chor223.krn
	7.0	['C4', 'G3', 'E3', 'C2']	8.0	['C4', 'G3', 'E3', 'C3']	False
	41.0	['E4', 'E4', 'G3', 'C#3']	42.0	['F#4', 'B3', 'A3', 'D#3']	False
chor177.krn
	0.0	['C#5', 'A4', 'E4', 'A2']	1.0	['C#5', 'A4', 'E4', 'A3']	False
	15.0	['B4', 'E4', 'A3', 'E3']	16.0	['E4', 'B4', 'G#3', 'E3']	False
	17.0	['A4', 'C#4', 'E3', 'A2']	20.0	['C#5', 'A4', 'E4', 'A2']	False
	35.0	['B4', 'E4', 'A3', 'E3']	36.0	['E4', 'B4', 'G#3', 'E3']	False
chor187.krn
	13.0	['E5', 'G4', 'D4', 'C3']	14.0	['E5', 'G4', 'C4', 'C2']	False
	15.0	['D5', 'G4', 'B3', 'G2']	16.0	['D5', 'G4', 'B3', 'G3']	False
	31.0	['G4', 'D4', 'C4', 'G2']	31.5	['G4', 'D4', 'G2', 'B3']	False
chor328.krn
	0.0	['B4', 'D4', 'G3', 'G2']	1.0	['A4', 'D4', 'B3', 'G3']	False
	16.0	['G4', 'D4', 'B3', 'G2']	20.0	['D4', 'B3', 'G3', 'G2']	False
	26.0	['F#4', 'D4', 'A3', 'D3']	27.0	['D4', 'A3', 'F#3', 'D3']	False
	30.0	['G4', 'E4', 'E3', 'C3']	31.0	['G4', 'E4', 'G3', 'C3']	False
chor002.krn
	7.0	['E4', 'B3', 'G#3', 'E2']	8.0	['B4', 'G#4', 'E4', 'E3']	False
chor290.krn
	0.0	['B4', 'G#4', 'E4', 'E3']	1.0	['B4', 'F#4', 'B3', 'E3']	False
	9.0	['G#4', 'E4', 'B3', 'E3']	10.0	['E3', 'E4', 'B3', 'G#3']	False
	31.0	['G#4', 'F#4', 'C#4', 'C#3']	32.0	['G#4', 'E#4', 'C#4', 'C#4']	False
chor088.krn
	0.0	['A4', 'E4', 'C4', 'A2']	1.0	['A4', 'E4', 'C4', 'A3']	False
	13.0	['A4', 'E4', 'C4', 'A2']	16.0	['E5', 'A4', 'C4', 'A2']	False
	21.0	['B4', 'E4', 'G#3', 'E3']	24.0	['B4', 'G#4', 'E4', 'E3']	False
chor030.krn
	10.0	['E4', 'B3', 'G3', 'E2']	12.0	['G4', 'E4', 'B3', 'E3']	False
	22.0	['E4', 'B3', 'G3', 'E3']	24.0	['G4', 'E4', 'B3', 'E3']	False
chor201.krn
	4.0	['E-4', 'D4', 'G3', 'C3']	5.0	['G4', 'E-4', 'C4', 'C3']	False
	7.0	['B-4', 'D4', 'G3', 'G2']	8.0	['B-4', 'G4', 'D4', 'G3']	False
	12.0	['E-4', 'C4', 'G3', 'C3']	13.0	['G4', 'E-4', 'C4', 'C3']	False
	23.0	['E-4', 'B-3', 'G3', 'E-2']	24.0	['E-5', 'B-4', 'G3', 'E-2']	False
	40.0	['G4', 'E-4', 'B-3', 'E-3']	41.0	['B-4', 'G4', 'E-4', 'E-3']	False
	55.0	['F4', 'E-4', 'B-3', 'B-2']	56.0	['B-4', 'F4', 'D4', 'B-3']	False
chor032.krn
	0.0	['E5', 'A4', 'C#4', 'A2']	1.0	['E5', 'A4', 'C#4', 'A3']	False
	16.0	['B4', 'G#4', 'B3', 'E3']	17.0	['B4', 'E4', 'G#3', 'E3']	False
chor272.krn
chor183.krn
	15.0	['G4', 'B3', 'D3', 'G2']	16.0	['G4', 'D4', 'B3', 'G3']	False
	31.0	['G4', 'E4', 'B3', 'E3']	32.0	['B4', 'E4', 'G3', 'E3']	False
chor090.krn
	0.0	['B-4', 'F4', 'D4', 'B-3']	1.0	['B-4', 'F4', 'D4', 'B-3']	True
	14.0	['B-4', 'F4', 'D4', 'B-2']	15.0	['F5', 'B-4', 'D4', 'B-2']	False
chor046.krn
	7.0	['D5', 'F#4', 'A3', 'D3']	8.0	['D5', 'F#4', 'A3', 'D3']	True
	9.0	['D5', 'A4', 'D4', 'F#3']	10.0	['A4', 'F#4', 'D4', 'F#3']	False
	15.0	['F#4', 'D4', 'A3', 'D3']	16.0	['F#4', 'D4', 'A3', 'D3']	True
chor217.krn
	9.0	['A4', 'F#4', 'D4', 'D3']	12.0	['A4', 'F#4', 'D4', 'D3']	True
chor117.krn
	3.0	['C5', 'A-4', 'E-4', 'A-3']	4.0	['A-3', 'E-5', 'C5', 'C4']	False
	9.0	['E-5', 'A-4', 'E-4', 'C3']	10.0	['E-5', 'A-4', 'E-4', 'C3']	True
chor165.krn
	15.0	['F4', 'C4', 'A3', 'F2']	16.0	['A4', 'F4', 'C4', 'F3']	False
	16.0	['A4', 'F4', 'C4', 'F3']	17.0	['A4', 'F4', 'C4', 'F3']	True
chor057.krn
	7.0	['G#4', 'E4', 'B3', 'E3']	8.0	['E5', 'G#4', 'B3', 'E3']	False
chor068.krn
chor230.krn
	0.0	['G4', 'D4', 'B-3', 'G2']	1.0	['G4', 'D4', 'B-3', 'G3']	False
	7.0	['D5', 'F4', 'B-3', 'B-2']	8.0	['D5', 'F4', 'B-3', 'B-2']	True
	23.0	['D5', 'F4', 'B-3', 'B-2']	24.0	['D5', 'F4', 'B-3', 'B-2']	True
	24.0	['D5', 'F4', 'B-3', 'B-2']	25.0	['D5', 'F4', 'B-3', 'B-2']	True
	25.0	['D5', 'F4', 'B-3', 'B-2']	26.0	['D5', 'F4', 'B-3', 'D3']	False
	33.0	['B-4', 'G4', 'D4', 'G2']	34.0	['D5', 'B-4', 'B-3', 'G3']	False
chor124.krn
	0.0	['B4', 'G4', 'D4', 'G3']	1.0	['B4', 'G4', 'D4', 'G3']	True
	7.0	['C5', 'A4', 'C4', 'A2']	8.0	['C5', 'E4', 'A3', 'A2']	False
	9.0	['B4', 'G4', 'D4', 'G2']	10.0	['G4', 'D4', 'B3', 'G3']	False
chor146.krn
	7.0	['G#4', 'E4', 'B3', 'E3']	9.0	['E4', 'B3', 'G#3', 'E3']	False
chor350.krn
	6.0	['C5', 'A4', 'F4', 'F3']	7.0	['C5', 'A4', 'F4', 'F3']	True
	22.0	['C5', 'E-4', 'G3', 'C3']	24.0	['E-5', 'G4', 'C4', 'C4']	False
	38.0	['C5', 'F4', 'A3', 'F3']	39.0	['C5', 'F4', 'A3', 'F3']	True
	46.0	['B-4', 'F4', 'D4', 'B-2']	47.0	['B-4', 'F4', 'D4', 'B-2']	True

Currently, the algorithm will always produce the same voicing twice.

Changing this should be a 2-line diff. PR coming soon.