New insights into the Swo phonology

A consonant is sometimes followed by a fricative in Swo. For example, some words are "b" followed by a vowel and others are "bv" in that same position.
What is growing clear is that the affricates (bv, pf, kf, dv, etc.) are all followed by a "high" vowel, /u/. I am going to be looking to see if the affricates are also found before the equally high vowels /i/ and /ɨ/. The barred "i" is high, central, unrounded.
So far, this looks very similar to what is happening in Badwe'e and in Nzime. In those languages, there is "oral cavity friction" accompanying a consonant when the following vowel is [+high].
These are subphonemic alterations in the pronunciation of a consonant.
If the Swo language truly has predictable affricatization before high vowels, the presence of the affricate would not be need to be marked.
The data would suggest this to be true. On Aug. 6, Pastor Ossimba and I observed that the affricate "ts" in [tsɨrɨ], "meat, animal", is indeed coming before a high vowel, /ɨ/, [high, central, unrounded]. It obeys the rule, therefore, that a stop becomes affricated before a high vowel, such as /i/, /ɨ/ or /u/.