Problems of phonostylistics

Stylistic modification of sounds
Stylistic modification is an expressive phonetic feature which lacks a phonological relevance in language system."Ser" is just a stylistic modification of "Sir", there is no specific historical use, it's just a simple way for a writer trying to give a familiar term an exotic sound.
Accommodation -Modification in the articulation of a segment for the purpose of easing a transition to a following segment, as when English /k/ is fronted before a front vowel or glide (key, back yard), or when /t/ shifts from alveolar to dental before a dental fricative (eighth) reduction is a quantitative or qualitative weakening of vowels in unstressed positions: board- blackboard, man- postman.

1. 
   R of length of vowel without changing its quality (quantitative R) you [ju:]-[ju]
   
2. 
   R of quality of vowels (qualitative R) you [ju:]-[jʊ]
   
3. 
   The omission of vowel or consonant sound (zero R) he is-he’s
   

Elision is the omission of one or more sounds (such as a vowel, a consonant, or a whole syllable) in a word or phrase, producing a result that is easier for the speaker to pronounce. Sometimes, sounds may be elided for euphonic effect.The elided form of a word or phrase may become a standard alternative for the full form, if used often enough. In English, this is called a contraction, such as can't from cannot. Contraction differs from elision in that contractions are set forms that have morphologized, but elisions are not. comfortable: /ˈkʌmfərtəbəl/ → /ˈkʌmftərbəl/ fifth: /ˈfɪfθ/ → /ˈfɪθ/ him: /hɪm/ → /ɪm/.
The syllable is one or more speech sound forming a single uninterrupted unit, which may be a word or a commonly subdivision of a word. In English a syllable is formed by any vowel alone or in combination with one or more consonants and by a word-final sonorant [m,n,l] immediately by a consonant. Are, it, man – 1 syllable,table, paper – 2 syl. The English Syllable has
onset : bar/more/; Initial segment of a syllable (Optional)
nucleus: or/are Central segment of a syllable (Obligatory)
coda : ought/ art Closing segment of a syllable (Optional). English syllable : starts with either 1, or 2 or even 3 consonants. nset: the beginning sounds of the syllable; the ones preceding the nucleus. These are always consonants in English. The nucleus is a vowel in most cases, although the consonants [ r ], [ l ], [ m ], [ n ], and the velar nasal (the 'ng' sound) can also be the nucleus of a syllable.
Coda
Final : any consonant except for h,r,w,j may be final consonant. / 2 kinds of
Final Cluster : pre-final+final/final+post final
Pre-finals(m,n,nasal,l,s : bump,belt) /
Post-finals(s,z,t,d,th : bets,beds)
So, the structure of English Syllable is asOnset Nucleus Coda Ex. "texts, sixths, helped, bonds, play, strings, students"