Aspirated consonant
Wu Chinese has a three-way distinction in stops and affricates: /p ph b/. In addition to aspirated and unaspirated consonants, there is a series of muddy consonants, like /b/. These are pronounced with slack or breathy voice: that is, they are weakly voiced. Muddy consonants as initial cause a syllable to be pronounced with low pitch or light (Yang  yang) tone.
What kind of voice are muddy consonants pronounced with?
slack or breathy
These are pronounced with slack or breathy voice: that is, they are weakly voiced.
muddy consonants