hello yintan actually i have researched and know very well about different sets of phonetics these sets come from people who are world leaders in transcribing thai into english the pronounciation i have offered above is from benjawan poomsan becker and it is spot on this work has been going on for a long long time and is far superior to the ipa system which of people are not familiar with anyway and superior to the rtgs system outdated but still used unfortunately because it has tonal marks and uses only english letters the pronunciation i offer is a big improvement on what is out there at the moment and it is something that english speakers can follow easily