Vowels LettER

The lettER vowel is very often conditioned orthographically in CamE. When it is represented by er/re, it is systematically represented by /a/; e.g. memb[a], teach[a], cent[a]. When it is represented by ure and o(u)r, it is rendered as /ɔ/; e.g. [figɔ, meƷɔ, tεkstʃɔ, stupɔ, kandɔ, lebɔ]  figure, measure, texture, stupor, candour, labour. Miscellaneous pronunciations include martyr and satyr which, under the influence of tire (CamE [taja], are pronounced [mataja] and [sataja]).