Bard Instrument Modifier Question

[nyclin]

Instrument modifiers (including Singing mod on epic) do:
- Increase haste values
- Increase slow values (up to a cap)
- Increase snare values (up to a cap)
- Increase HP regen values
- Increase mana value for mana adders (lvl 20 and lvl 32 songs) but NOT the level 55 song. Instruments only modify the HP regen for Cantata.
- Increase all raw stats and resists values granted or debuffed by songs
- Increases faction mod amount, up to an unknown cap
- Increase damage for both DD and DoTs

Instrument mods do NOT:
- Increase mez duration or reduce resist chance. The lvl 28 mez has a -MR component so this would be modified by instruments and would reduce resists after the first application, but the instrument mod does not strictly make it easier to land.
- Increase charm duration or reduce resist chance
- Increase duration of any songs, offensive or defensive
- Alter number of effects dispelled (dispel counters)
- Change distance travelled by Shadowstep-type spells
- Increase stun duration (lvl 55, 56, and 59 songs)
- Increase mana regen from Cantata, see above

Things I'm unsure on:
- Rune values from eg Shield of Song
- Mana drain value from some songs. Some use a flat -mana component, others use a mana-DoT. Given the logic applied to Cantata vs Chorus, I'd assume it affects the lvl 35 song (flat -mana) but not lvl 57 (mana DoT)
- Hate modifier on Song of Dawn