First of all jazakumullahu kheyral jaza for your efforts teaching millions of Muslims tajweed via this great website. Ta qabbalallah.
I have a major problem in pronouncing all mufakhham [full mouth] letters. Can you please give me some ways or ideas of practicing on this problem? May Allah reward you, a'ameen.
Wa alaikum assalaam wa rahmatullahi wa barakatuh.
Jazakum Allahu khairan.
The applied definition of tafkheem is: A heaviness that enters the body of the letter, so that the mouth is filled with its reverberation (echo).
There are three elements in making tafkheem. The first is: elevating the posterior tongue to the roof of the mouth (soft palate), the second: creating more space between the roof of the mouth and the bottom of the mouth, and the third: focusing the pressure of the letter to the roof of the mouth.
The third part may be your problem or it may be a combination of the three elements. Many times students of the Qur’an let the sound focus forward and this greatly decreases the tafkheem. Focusing the sound up to the roof (hard palate) of the mouth while raising the posterior portion of the tongue and increasing the space between the roof and bottom of the mouth is what gives maximum tafkheem. Please also see the following link:
Practice these three steps and at the same time, listen to known mastered shuyookh, such as Sheikh Al-Husary and Sheikh Abdullah Basfar and try to imitate the sound of tafkheem they make. If you have a teacher, the corrections of the teacher will help you determine when you are closer to the correct sound and when you still need to work on it. May Allah make the correct tafkheem mechanism and sound easy for you and increase you in knowledge of the Qur'an.
Jazakum Allahu khairan and may Allah reward you too. Wa assalalam alaikum.