Check my posts.I work on both sides, also on articulation. M Test and its effect on oxygen saturation is my discovery.Nobody knows it in the world. It is valid for everyone. It shows a measurable difference between a stutterer and a normal person. Every stutterer has a different level of high exhale rate. That's why people say every technique is not useful for every one. I get rid of this high exhale rate, so there is no need for more technique, which means it works with every one. I have 750 members, 50 members tried it.Everybody got the same result. I can make people apply airflow with different exhale time setting. A person having a higher exhale rate, discharges air for 2 second instead of 1, and it works for him also. It is a pity that no scientist could discover my findings up to now.