Hi. I have worked with QC of transcribed and translated texts before, and while I cannot guarantee 100% accuracy without listening to the audio first (sometimes the accent, speech habits or the poor quality of recording make some parts impossible to understand), I will give you the best final text possible in as close to perfect English as the speaker permits. Although I live in Brazil now, I´m an American writer, editor and proofreader, a native English speaker with extensive experience at audio transcription. How many speakers are there? Where are they from? Is the environment noisy? I´d be glad to take your test for free, if it isn´t long. Please contact me for further discussion, I can give you what you need here. Regards, David