Since someone asked on Reddit and I can't seem to find the answers anywhere, I ended up testing them myself and I would like to share the test results here hoping to answer some of the questions people may have.
Everything is still kinda wip atm.
Q1: How does mp drain to DA really works.
A: Based on current result, it drains 5% of current max mp and 1 mp spent add 1% DA.
Q2: Does it proc offhand.
A: Yes
Q3: How does it stack with other sources of multi attack.
A:Based on result from Chiaia it can only proc on 1st swing.
Q4:How does HQ version work.
A: Based on results from Snaps, it procs on every single attack round for the first attack in the round. If you're offhanding it, it procs on the first strike for your offhand. The extra Store TP = MP Consumed/2 (half the double attack rate.)
Q5: Is it worth it to sacrifice buff slots for refresh.
Looking at every refresh buffs:
RDM refresh 3: 15
+8 brd ballad x3: 30 (I think)
Crooked +7 no.11 evokers: 14
Entrust Indi-refresh: 6?? (I think)
Aspir samba: varies
Total refresh: 65+
Effectively 65%+ DA every 3 sec using 3 song slots, 1 roll slot and 1 entrust bubble slots.
Drain da MP for 50 STP plz!!!
Q6: Can Raetic bangles proc on magic damage?
A: Yes.
Will update the info on this page as I go, or if anyone else willing to test them.
Any opinions are welcomed.
-----------------------
Test #1:
Job: RDM in escha (so I can get as much refresh as possible)
Completely naked, 0 multi attack in gears/spell and zero haste too.
Full mp pool: 1246 Mp pool after 1 swing: 1184 62 mp drained.
Only swing at the enemy at 1246 mp, then I turn and wait until mp full again to do next swing so every swing drains 62 mp.
Result after 100 swings: DA proc: 60, no proc: 40.
This result is extremely close to amount of mp drained so proc rate is very likely to match mp drained. If you lose 60 mp then you get 60% proc rate etc. Unless someone else has different result.
Test #2:
Mainhand lv1 excalipoor offhand raetic so I can tell which swing came from offhand with dmg differences. Once again 0 multi attack in gears and spell. DA does proc on offhand swings.
Test #3
COR/RDM, 539 full mp, 513 after 1 swing. 26 MP drained.
DA proc: 26, no proc: 80. Proc rate 24.5% after 106 swings.
Test #4
Raetic Bangle: 1310 max MP, got hit 125 times, proc 12 times.
More to come, hopefully.