Game Mechanics: Resonant BP effect not getting instrument bonus

[Triode]

Just got my bard's thurg breastplate a couple of nights ago, and the clickable selos song of travel doesn't seem to receive instrument bonuses. Compared to the same song played normally, with the same selos drum equipped, run speed is much much slower.

Running some basic google searching doesn't seem to turn up anyone discussing/complaining about this back during classic, so I'm hoping it is a bug? (Or maybe I'm just not hitting the magic search term...) I was really pumped to save a spell slot with this upgrade, but that's a no go as the effect presently stands. Has anyone else looked into this?