Editing Oscan language (section)

===Vowels===
Vowels are regularly lengthened before ''ns'' and ''nct'' (in the latter of which the ''n'' is lost) and possibly before ''nf'' and ''nx'' as well.{{sfn|Buck|1904|p=47}}
[[Anaptyxis]], the development of a vowel between a [[Liquid consonant|liquid]] or [[Nasal consonant|nasal]] and another consonant, preceding or following, occurs frequently in Oscan; if the other (non-liquid/nasal) consonant precedes, the new vowel is the same as the preceding vowel. If the other consonant follows, the new vowel is the same as the following vowel.{{sfn|Buck|1904|p=50}}

====Monophthongs====

=====A=====
Short ''a'' remains in most positions{{sfn|Buck|1904|pp=29–30}}
Long ''ā'' remains in an initial or medial position. Final ''ā'' starts to sound similar to {{IPA|[ɔː]}} so that it is written ''ú'' or, rarely, ''u''.{{sfn|Buck|1904|p=30}}

=====E=====
Short ''e'' "generally remains unchanged;" before a labial in a medial syllable, it becomes ''u'' or ''i'', and before another vowel, ''e'' raises to higher-mid [ẹ], written ''í''.{{sfn|Buck|1904|pp=31–32}}
Long ''ē'' similarly raises to higher-mid [ẹ], the sound of written ''í'' or ''íí''.{{sfn|Buck|1904|p=33}}

=====I=====
Short ''i'' becomes written ''í''.{{sfn|Buck|1904|p=34}}
Long ''ī'' is spelt with ''i'' but when written with doubling as a mark of length with ''ií''.{{sfn|Buck|1904|p=35}}

=====O=====
Short ''o'' remains mostly unchanged, written ''ú'';{{sfn|Buck|1904|p=36}} before a final ''-m'', ''o'' becomes more like ''u''.{{sfn|Buck|1904|p=37}}
Long ''ō'' becomes denoted by ''u'' or ''uu''.{{sfn|Buck|1904|p=38}}

=====U=====
Short ''u'' generally remains unchanged; after ''t'', ''d'', ''n'', the sound becomes that of ''iu''.{{sfn|Buck|1904|p=40}} 
Long ''ū'' generally remains unchanged; it changed to an ī sound in monosyllables, and may have changed to an ''ī'' sound for final syllables.{{sfn|Buck|1904|p=41}}

====Diphthongs====

Oscan had the following diphthongs:{{sfn|Wallace|2007|p=13}}
{| class="wikitable"
|-
| /ay/ || /ey/ || /oy/
|-
| /aw/ || /ew/ || /ow/
|}

The sounds of [[diphthong]]s remain unchanged from the Proto-Indo-European origins.{{sfn|Buck|1904|p=18}}