Whether two voices reach a perfect interval by similar motion from an imperfect one (a hidden/direct fifth or octave).
How strictly the approach is judged is the caller's to say, because the two textures do not agree about it:
fourPart (the default) applies the step exception of the chorale — the
approach is allowed when the upper of the two voices moves by step, so only
leaps into the perfect interval are flagged. That exception is written for
the outer voices of a four-part texture, where the other two cover the
arrival.twoVoice exempts no approach. With nothing between them, two voices
moving the same way into a perfect fifth or octave expose it however the
upper one got there, and strict sixteenth-century writing forbids it
outright.Optionalstrictness: "twoVoice" | "fourPart"
Which reading to judge the approach by.
Whether two voices reach a perfect interval by similar motion from an imperfect one (a hidden/direct fifth or octave).
How strictly the approach is judged is the caller's to say, because the two textures do not agree about it:
fourPart(the default) applies the step exception of the chorale — the approach is allowed when the upper of the two voices moves by step, so only leaps into the perfect interval are flagged. That exception is written for the outer voices of a four-part texture, where the other two cover the arrival.twoVoiceexempts no approach. With nothing between them, two voices moving the same way into a perfect fifth or octave expose it however the upper one got there, and strict sixteenth-century writing forbids it outright.