Hi M4M 
General
- Maybe you can add soft-sliderslide, normal-sliderslide to silence slider sound during hold it.
- Just my suggestion, your background have a bit low quality maybe try this?
Hard
00:23:493 - 00:30:740 : I think this part you use soft sampleset would be better. (make more vision of hitsound xD)
00:23:493 (1) - Use Drum-finish sampleset here to follow like previous rhythm.
00:23:735 (G) - Remove this green section.
00:24:218 (3) - About this slider... start you use drum-clap and end use only drum sample set.
00:24:942 (4) - About this slider... start you remove clap then use drum-whistle here and end use drum-finish.
00:26:150 (2) - This start slider use drum-clap and end slider use only drum sampleset.
00:26:875 (3) - This start slider you remove clap then use drum-whistle here and end use drum-finish.
00:27:600 - 00:30:740 You will see my loops right? apply them all! :3
00:31:223 (G) - Add green timing section to Normal 25%
00:35:893 (2,3,4) - Move this note please lol... I suggest (2) 318:60, (3) 300:80 and (4) 295:106 to make suitable your slider.
00:37:986 (3) - You can add whistle here at start and end slider :3
00:45:716 (3) - Same above suggestion.
00:46:923 (G) - This green timing section would be here; 00:46:682 =.=
01:25:330 - 01:32:818 Use same rhythm that I give you above c:
01:31:851 (2) - This slider you can make more blanket here by move 2nd waypoint 114:246 and last waypoint 66:312
01:32:576 (3) - If you fix above move this note 0:264 (don't worry about spacing much in Hard diff o3o)
01:39:823 (3) - Like suggestion I said before c:
01:47:552 (3) - ^ Same
01:48:760 (G) - This green timing section would be here; 01:48:518 =3=
Normal
00:20:353 (2,3) - I don't know why you use DS 0.50x? Newbie can confuse here, so I suggest you move (2) to 118:298 and (3) 80:380 to make same spacing all your difficulty (don't worry it's not out screen -w-b)
00:23:493 - 00:30:740 and 01:25:330 - 01:32:576 About this part you can use like my Hard suggestion, however your rhythm it's okay here.
00:31:947 (2) - Select all note and use whistle then remove whistle at end slider to follow rhythm more?
01:41:513 (2) - Same above suggestion.
Gero's Easy
00:16:247 (2,3) - I don't know why this rhythm it's only one in your difficulty? Change to easy like this http://puu.sh/iD13C/ae50c2904d.jpg ?
Really beautiful symmetry notes in this difficulty lol
I like old music haha, good luck~

General
- Maybe you can add soft-sliderslide, normal-sliderslide to silence slider sound during hold it.
- Just my suggestion, your background have a bit low quality maybe try this?
Hard
00:23:493 - 00:30:740 : I think this part you use soft sampleset would be better. (make more vision of hitsound xD)
00:23:493 (1) - Use Drum-finish sampleset here to follow like previous rhythm.
00:23:735 (G) - Remove this green section.
00:24:218 (3) - About this slider... start you use drum-clap and end use only drum sample set.
00:24:942 (4) - About this slider... start you remove clap then use drum-whistle here and end use drum-finish.
00:26:150 (2) - This start slider use drum-clap and end slider use only drum sampleset.
00:26:875 (3) - This start slider you remove clap then use drum-whistle here and end use drum-finish.
00:27:600 - 00:30:740 You will see my loops right? apply them all! :3
00:31:223 (G) - Add green timing section to Normal 25%
00:35:893 (2,3,4) - Move this note please lol... I suggest (2) 318:60, (3) 300:80 and (4) 295:106 to make suitable your slider.
00:37:986 (3) - You can add whistle here at start and end slider :3
00:45:716 (3) - Same above suggestion.
00:46:923 (G) - This green timing section would be here; 00:46:682 =.=
01:25:330 - 01:32:818 Use same rhythm that I give you above c:
01:31:851 (2) - This slider you can make more blanket here by move 2nd waypoint 114:246 and last waypoint 66:312
01:32:576 (3) - If you fix above move this note 0:264 (don't worry about spacing much in Hard diff o3o)
01:39:823 (3) - Like suggestion I said before c:
01:47:552 (3) - ^ Same
01:48:760 (G) - This green timing section would be here; 01:48:518 =3=
Normal
00:20:353 (2,3) - I don't know why you use DS 0.50x? Newbie can confuse here, so I suggest you move (2) to 118:298 and (3) 80:380 to make same spacing all your difficulty (don't worry it's not out screen -w-b)
00:23:493 - 00:30:740 and 01:25:330 - 01:32:576 About this part you can use like my Hard suggestion, however your rhythm it's okay here.
00:31:947 (2) - Select all note and use whistle then remove whistle at end slider to follow rhythm more?
01:41:513 (2) - Same above suggestion.
Gero's Easy
00:16:247 (2,3) - I don't know why this rhythm it's only one in your difficulty? Change to easy like this http://puu.sh/iD13C/ae50c2904d.jpg ?
Really beautiful symmetry notes in this difficulty lol
I like old music haha, good luck~