You might know I'm picky, but here goes nothing.
First, have a new soft-hitnormal.
http://puu.sh/3Kqg0.wav (Tested with 4k spring, other modes might be too dense... but it does the job, as a rhythm aid. Point is, default soft-hitnormal is so bad x.x)
[4k Spring]
Suggestions, take them seriously though. Their goal is a 4k that feels more solid.
00:12:977 (12977|2) - Remove.
00:15:894 (15894|3) - ^
00:19:227 (19227|3) - ^
00:19:644 (19644|0) - ^
00:42:873 (42873|0) - ^ (Simplifies rhythm a LOT taking out these)
00:46:727 (46727|0) - Turn to 1st and 3rd lane jump
00:48:811 (48811|3,49227|2,49540|1,49540|3,49852|2,50061|3,50477|0) -
http://osu.ppy.sh/ss/885350 Change to this.
00:56:727 (56727|2) - Add note in lane 2.
00:59:852 (59852|2) - Remove
01:00:061 - Add onto lane 3.
01:10:061 (70061|0,70061|3,70477|1,70894|0,70894|3,71311|1,71727|0) - Switch the [14] with the [2].
01:13:811 (73811|2,74227|0,74227|3) - Switch as well.
01:23:811 (83811|3,84227|2,84644|3,85061|2,85477|3) - Distribute instead of loading onto right hand.
01:26:311 (86311|3,86311|1,86519|2,86727|0) - Switch [24] with [1].
01:37:144 - Insert note.
01:42:873 (102873|0,102977|1) - Switch to right hand.
01:46:727 - Difficulty jump is HUGE. lessen plz
02:41:311 (161311|0,161311|2,161727|3) - Switch.
02:47:769 (167769|2) - Remove
02:47:977 (167977|0,167977|3,168186|2,168394|1) - Switch
02:51:727 - Insert note
03:03:973 - This whole section would play better as a series of long notes, and you also get to introduce your main 7k's map mechanic better! Win-win.
[5k Summer]
00:19:852 (19852|1) - I get that you want to add symmetry with the previous pattern but the player's ready. Remove this so that whole pattern follows the flute.
01:37:162 - Add note.
01:41:936 (101936|4,102144|3,102352|4,102561|3,102769|4) - Distribute and add notes to white ticks.
03:17:665 (197665|4,197769|3,197873|2,197977|3,198081|4,198186|3,198290|1,198394|4,198394|0) -
http://osu.ppy.sh/ss/885370 change to this for better pitch relevancy.
[6k Autumn]
00:13:081 (13081|1,13290|2) - Remove.
00:19:227 (19227|5,19331|5) - Ugly! (As well as the minijacks. Distribute plz)
00:52:561 (52561|0) - Change to 6th lane.
00:53:394 (53394|0) - Change to 3rd lane and move notes currently in 3rd lane to 1st lane.
00:55:894 (55894|4,56727|2) - Lane switch. Pitch relevancy.
00:57:977 - Add note as previous patterns had 2 notes. Same ahead.
01:32:769 (92769|2) - Switch to lane 2
01:33:186 (93186|3) - lane 5
01:33:394 (93394|2) - Lane 4
01:35:894 (95894|5,95894|3,96102|3,96311|0,96311|2,96519|2,96727|3) - ^
02:05:894 (125894|3) - Lane 6
03:01:727 - You were using 1/3 just before. Why not now?
03:06:848 - Even more so if you start using it back again!
(I know why but still... it's kind of weird.)
[7k Winter]
00:19:227 (19227|5,19331|5) - eww jack
02:31:519 (151519|2) - Turn into hold for extra oomph.
03:24:852 (204852|0,204852|6) - Shorten by half so you can...
03:25:061 - Add a note here and end with some extra oomph as well
\o\.
That 1/3 1/4 switch you do before is also here. Hnnnnng.
other than that this diff is perfect ... (if only for that ugly soft-hitnormal... hmm)