Oh man... Sanctuary... The song with like 100 reviews... the ultimate challenge as an Audio Reviewer. My review started getting long enough that I needed to split it up into sections, where I would critique individual aspects of the song.
MELODY
Not even gonna bother, the melodies are great. Some are better than others, but I'll get into this in the arrangement section.
MIXING
You've got to be kidding me. The mixing is perfect. Splitting this review up is starting to look dumb. NEXT SECTION
PERCUSSION
Looove. A highlight for me is 1:08 with the vaguely ethnic feel. Also 1:28 with the driving boomy hits. Or the tense tams at 3:11. So much detail work!
ARRANGEMENT
The buildup from 1:00 to 1:20 is really well done and seamless, and the transition at 1:28 is just lovely. Which is good too, because it leads to THE BEST MELODY IN THE HISTORY OF NEWGROUNDS. Alright, that might be *slightly* superlative, but I could really point to only a handful of songs with comparable melodic expressivity to that point, at least on this site.
So let's talk about arrangement - and move in from macro level to micro level arrangement. I assume we're both in agreement that 1:28 is the obvious highlight of this piece. I mean, there is a lot of other great stuff in this piece, but it's not going to top 1:28. So what I think is that 1:28 should come later into the piece. Like, it's the climax, so it should come near to the end, otherwise you're just waiting for the piece to build down, and people are much more willing to let the song build up (rising tension) rather than waiting for the song to build down (falling tension). I think that all the stuff starting at around 2:00 once the 1:28 melody is finally been played out could be moved to the beginning of the song.
While we're talking about it, the thing that I notice that really good artists do is that they'll foreshadow the melody ahead of time. An excellent example of this is "Alone and Adrift" by RetromanOMG (http://www.newgrounds.com/audio/listen/542368) The synth at :29 is really beautiful, and then at 1:00 it develops even more, but once the real melody comes in at 1:23 you realize that everything else was just hinting at that melody, and that makes it even better! So while that 1:28 thing is asdfawesome, you could build up the tension even more and make it better by having hints at the melody earlier in the song. (You may be thinking, ah, that's the thing that johnfn did in "The Fight"! Actually, that was completely unintentional but ... sure.)
The irony is that you do build up a melody which I hear quite a few times through the song - first heard at :36 - but imo it's not as interesting. I mean, it's not bad, and I particularly like that take on it at 1:01 with the crazy chords and trills, but why choose that one when you could have chosen 1:28? :P
Last thing about 1:28 is that the structure of the climax is [BIG 1:28 MELODY] [little 1:28 repeated melody]. In the aim of building up tension for the big melody, I'd suggest to reverse the order, so that you do the quiet idea before the big one. Maybe you could put the melody in a woodwind and tweak it slightly.
I enjoy the stuff towards 2:30, especially that little flair at 2:42 (that was nicely foreshadowed at 2:11, in a different timesig!). I kinda wish we'd hear that flair again, maybe just a little later in a variation.
Again I feel like the arrangement is flip floppy, because this is the great exploration, and 1:28 is where you finally find the treasure!
Last thing: I don't really like that section at 3:03 - it's a tension builder, but it's out of place right near the end of the song, since the next section is very calm and not tense at all.
NIT PICKS
One fun nit pick at 3:43: your melody is building up a lot of tension by wanting to eventually resolve down to the root note (I'm just going to call it C because I only have relative pitch), and the trill ramps up the tension even more... but then you actually hit C as you're going down to B, which dissolves all tension. I really like the idea of drawing out that final resolution though, that plus the OCD timpani roll makes for a great ending.
While the 1:05 trills are awesome and really attention-grabbing, I don't really get what the point of them are (from an arrangement/compositional point of view). They seem to be leading into that hit at 1:07, but that isn't all too obvious.
The other thing I want to nit pick is the quantization errors/humanization you put in. Like 3:31 for example. I mean, if we're to imagine this is being played by a professional orchestra, then they probably wouldn't be making such obvious mistakes. (I was unsure if that was the intent, or if you were going for rubato here - if you were going for rubato then I think you should slow down the entire melody gradually rather than just a singe note.)
On the other hand I like the callback to the melody all the way back at :39. Very nice way to tie the piece together :)
OVERALL
In conclusion, good luck fitting a response to this within the character limit ahahahahh
No but seriously this is great and has a lot of detail - it's amazing that I can write all this about it and still feel like I'm only scratching the surface. I can see why this would be one of your favorite pieces. Is it as good as Encapsulation? Well, this is far more complex, and has far more melodic content, but Encapsulation was arranged much better, and what melodic stuff it had was slightly more mature. So who knows.
...Also Encapsulation was done in 3 days and this was done in a month. That is quite an improvement.
Alright I really need to wrap this thing up. This song is epic, easy 10/10.