Please make 2 records. :)
1. normal and natural sound.
2. little bit exaggerated sound, that way I can discriminate between two.
(1) [ɔ] vs. [o] caught vs. coat
(2) [u] vs. [ʊ] wood vs. would
(3) [dʒ] vs. [z] rage vs. raise
(4) [θ] vs. [f] thin vs. fin
Good Luck!