cryptic no 227

5a Where to learn how to grade hotel suites ?L???????? (10)
grade - class + hotel suites - rooms - CLASSROOMS = where to learn how to

19a Such a noisy part of Red River City (5)
sucH A NOIsy - part of (indicates word is part of a phrase) - HANOI = City on Red River, Vietnam.

22a Decree via radio mishandled by head of nation (6)
radio + mishandled (indicates anagram) + head of Nation - n - ORDAIN = decree

29d Kills Sam to get back his final property ?a??a???? (9)
sam - to get back (reverse) - mas + hiS final (s) + property - acres - MASSACRES - kills

Sorry about the other two. The brain is still a bit fuzzy.I will go and have some brekky and a cuppa and will get back to you - unless someone else comes along in the meantime with the answers.

1a Volume Controllers L??????i?ns? (10)
Can you check this out again, please. You wrote (10) for the number of letters, but you also wrote L + (6 x ?) + i + ? + ns + ?, which adds up to 12 letters.

Any more crossing letters for this and 2d would help.

Thanks for the answers
1a L?????i?n? (10)
2d crosses it