Excerpt from The Imperial Gazetteer of India, Vol. 16
a has the sound of a in "woman."
a has the sound of a in "father."
e has the vowel-sound in "grey."
i has the sound of i in "pin."
i has the sound of i in "police."
o has the Это и многое другое вы найдете в книге The Imperial Gazetteer of India, Vol. 16 (Classic Reprint)