I think you need spread the sounds like 00:00:635 (snare? cymbal?) from the whistles...
Check the Hitsounds again if you change something with Ctrl+"x", because sometimes inverts the notes with Hitsounds lol
00:00:635 (635|2) - to |3|
00:01:908 (1908|2) - to |3|
00:02:635 (2635|2) - you can move this to |1|
00:03:544 (3544|2) - to |3| and 00:03:726 (3726|3,3908|2) - Ctrl+H , and 00:04:090 (4090|1) - to |3|
00:04:817 (4817|1) - to |0|
00:05:362 (5362|1,5544|2) - Ctrl+H
00:06:453 (6453|2) - to |3|
00:07:180 (7180|3) - to |0|
00:07:726 (7726|3,7908|0,8090|2) - Ctrl+H
00:09:544 (9544|1,9726|2) - Ctrl+H
00:10:635 - I think you need add a note here...up to you.
00:12:453 (12453|2,12635|0,12817|3,12999|1) - Ctrl+H
00:13:544 (13544|2) - to |0| and 00:13:726 (13726|3,13908|0) - Ctrl+H
00:15:362 (15362|1) - to |3| , 00:15:544 (15544|2) - to |1| , 00:15:726 (15726|3) - to |2| and 00:15:908 (15908|1) - to |0|
00:16:453 (16453|2,16635|3,16817|2,16999|0,17180|1) -
http://i.imgur.com/HXowcRt.jpg00:18:635 (18635|3) - to |2|
00:19:362 (19362|1,19544|0,19726|3,20090|2) -
http://i.imgur.com/rtXdGy8.jpg00:24:090 (24090|1,24271|2,24453|0,24453|3) - Ctrl+H and 00:24:999 (24999|1) - to |3|
00:29:908 (29908|1,30090|2,30271|0,30271|3,30817|1,30999|2,31180|0,31362|1,31544|2) - Ctrl+H... and about 00:30:271 (30271|3) - Longnote ends in 00:30:817, same that 00:27:362 (27362|0) or 00:24:453 (24453|3).
00:35:726 (35726|1,35908|2,36090|0,36090|3,36635|3) - maybe Ctrl+H
From 00:46:635 to 00:58:271 - You can use one (and only one column) for the whistles like 00:47:180 (47180|0) or 00:47:908 (47908|2).
http://i.imgur.com/tQ1nhWN.jpg <- example, choose another column if want.
01:02:271 (62271|3) - to |1|
01:04:817 (64817|2) - to |0|
01:04:999 (64999|3) - to |1|
01:08:817 (68817|0,69180|3) -
http://i.imgur.com/PeehgQM.jpg01:12:453 (72453|2,72635|1) - Ctrl+H
01:18:271 (78271|0,78362|1,78453|2,78544|3) -
http://i.imgur.com/FotGf5A.jpg 01:23:908 (83908|1) - to |0|
01:38:453 (98453|0,98635|1) - Ctrl+G
01:44:999 (104999|2) - to |3| , 01:45:180 (105180|3) - to |2| , and 01:45:362 (105362|2) - to |1|