The Regents' Muse

1.  2.  3.  4.   g 5. 6.  7.  8.
  g   g   g   g 9. g   g   g  
10.     g 11.          
  g   g 12. g   g   g   g   g  
g 13.              
14. g   g   g   g   g   g   g  
15.        g 16.     g 17.  
  g   g   g g g g g   g 18. g  
19.   g 20.   21. g 22.       
  g 23. g   g   g   g   g   g  
24.               g
  g   g   g   g   g   g   g 25.
26.           g 27.    
  g   g   g   g   g 28. g   g  
29.       g 30.        

ACROSS

1,9-Down,5. 
     Heartlessly I see thee fight
             the Regents' Muse.
     Is it really on/off white
             and solved by blues?      (3,5,6,6)
5.  see 1-Ac
10.  Saying "yes",  the tangled mane         (4)
11.          is found in coils
     as in pipe and mangled cane            (10)
13.          of polar soils.

     Hot & spicy,  very old
             and knowing much,             (6,8)
15.  crazy hinged sign fin'ly told
             (so oft) of such!             (4,3)

16.  Points to chromosomes so "hot"          (4)
19,17,3-Down.       you should have one -
     cheap it is at one ingot            (2,2,2)
20.          (cheap, not like son!)          (4)

22.  On/off process herein starred
             Moog LFO                        (7)
24.  so evokes rut (not L/R)           (4,5'1,4)
26.          "Revo..." ?                    (10)

27.  Orange sign ...                         (4)
29.                  ... to make relief
             a dash with God?                (6)
30.  Compact sits on road: belief
             is just as odd!                 (8)

DOWN

1.   Not this part,  not hated crag          (4)
2.           in times of flats.              (8)
3.  see 19ac
4.   Sweet looked after member's tag         (7)
6.           deliv'ry stats.

     Maybe half a quarter hence
             they send it on.          (2,2,3,5)
7.   Acts of council of defence              (6)
8.           mean edit on.                  (10)
9.  see 1-ac
- - - - - 
12.  Fine things are reportedly
             for parting way  -             (12)
14.  - mad vote HM King to be
             the way to play.

     Any blue on to another blue?          (6,4)
18.          Gee - bung-coop bull!         (4,4)
21.  Act reversing slightly,  true,          (6)
22.          explosive,  full,

     stuffed with Rome in chaos / pain.      (7)
23.          Great second,  great!           (6)
25.  Piece of earth misleads my brain        (4)
28.          to choose for late.             (2)