Bought Homesick and instantly loved this song, wanted to play it so I 
figured it out and here is my version. Hope you guys like it!
Corrections are welcome, I know it's probably not 100%.

----------------------------------------------------------------------------
                    The Downfall Of Us All - A DAY TO REMEMBER
----------------------------------------------------------------------------

Tuning: Drop C [CGCFAD]

 INTRO:
D|-------------------------------------------------------------------------|
A|-------------------------------------------------------------------------|
F|-------------------------------------------------------------------------|
C|-------------------------------------------------------------------------|
G|-00000000-00-00--0-0-0-00-00--99999999-99-99-55-55-55----4---------------|
C|-00000000-00-00--0-0-0-00-00--99999999-99-99-55-55-55-5h7----------------|

D|-------------------------------------------------------------------------|
A|-------------------------------------------------------------------------|
F|-------------------------------------------------------------------------|
C|-------------------------------------------------------------------------|
G|-00000000-00-00--0-0-0-00-00--99999999-99-99-55-55-55-5555---------------|
C|-00000000-00-00--0-0-0-00-00--99999999-99-99-55-55-55-5555---------------|

 VERSE:
D|---------------|
A|---------------|
F|---------------|
C|---0---9---5---| [x2]
G|---0---9---5---|
C|---0---9---5---|

 PRE CHORUS:
D|-------------------------------------------------------------------------|
A|-------------------------------------------------------------------------|
F|-------------------------------------------------------------------------|
C|-99999999--8888888-55555555-------------------99999998--5555-------------|
G|-99999999--8888888-55555555-------------------99999998--5555-------------|
C|-99999999--8888888-55555555--0-0-2-4-2-2-0-0--99999998--5555-------------|

 CHORUS:
D|-------------------------------------------|
A|-------------------------------------------|
F|-------------------------------------------|
C|-000-22-00-55-00-77777-000-2222-555555555--| [x2]
G|-000-22-00-55-00-77777-000-2222-555555555--|
C|-000-22-00-55-00-77777-000-2222-555555555--|
 Then:
D|-------------|
A|-------------|
F|-------------|
C|-22222222-55-|
G|-22222222-55-|
C|-22222222-55-|

And back to intro part...

D|-------------------------------------------------------------------------|
A|-------------------------------------------------------------------------|
F|-------------------------------------------------------------------------|
C|-------------------------------------------------------------------------|
G|-00000000-00-00--0-0-0-00-00--99999999-99-99-55-55-55----4---------------|
C|-00000000-00-00--0-0-0-00-00--99999999-99-99-55-55-55-5h7----------------|

D|-----------------------------------------------------------------|
A|-----------------------------------------------------------------|
F|-----------------------------------------------------------------|
C|-----------------------------------------------------------------|
G|-00000000-00-00--0-0-0-00-00--99999999-99-99-55-55---------------|
C|-00000000-00-00--0-0-0-00-00--99999999-99-99-55-55--[pickslide]--|

 BREAKDOWN 1:
 Guitar 1
D|---------------------------------------------------------|
A|---------------------------------------------------------|
F|---------------------------------------------------------|
C|-00-4h5-00-5p4-00-7p4-00-5p4-00-4h5-00-5p4-00-2h4-00-4p2-|
G|---------------------------------------------------------|
C|---------------------------------------------------------|

D|---------------------------------------------------------|
A|---------------------------------------------------------|
F|---------------------------------------------------------|
C|-00-4h5-00-5p4-00-7p4-00-5p4-00-4h5-00-5p4-00-2h4-4------|
G|---------------------------------------------------------|
C|---------------------------------------------------------|

 Guitar 2
D|--------------------------------------|
A|--------------------------------------|
F|--------------------------------------|
C|-000------000------999--999--555--555-|
G|-000------000------999--999--555--555-|
C|-000------000------999--999--555--555-|

[Sorry guys, I haven't gotten the whole second breakdown right yet, as soon
as I do I'll have it up, I have the second guitar though.]

 BREAKDOWN 2:
 Guitar 2
D|----------------------------------------------------------------|
A|----------------------------------------------------------------|
F|----------------------------------------------------------------| [x2]
C|-0-0-0-0-------0-0-0-------5-5-5-5-------7-7-7------------------|
G|-0-0-0-0--4-5--0-0-0--4-5--5-5-5-5--4-5--7-7-7--4-4h5-----------|
C|-0-0-0-0-------0-0-0-------5-5-5-5-------7-7-7------------------|

D|----------------------------------------------------|
A|----------------------------------------------------|
F|----------------------------------------------------| [x2]
C|----------------------------------------------------|
G|-----------4-5---------4-5-----------4-5------------|
C|-000000000-----0000000-----555555555-----77-77-7-77-|

D|-------------------------------------------|
A|-------------------------------------------|
F|-------------------------------------------|
C|-------------------------------------------|
G|-------------------------------------------|
C|-000-22-00-55-00-77777--000-2222-555555555-|


 OUTRO:
D|-----------------------------------------------------------|
A|-----------------------------------------------------------|
F|-----------------------------------------------------------|
C|-----------------------------------------------------------|
G|-----------------------------------------------------------|
C|-00000000-00-00--0-0-0-00-00--00000000-00-00-00-00-0-00-00-|


And here's the order for you:

INTRO
VERSE
PRE CHORUS
CHORUS
INTRO PART
VERSE
BREAKDOWN 1
PRE CHORUS
CHORUS
BREAKDOWN 2
CHORUS
OUTRO

This sounds right to me, they're not all exactly the same every time,
but if you listen to the song you can hear all the small changes,
I have all of the right parts down. Happy playing!