Under Yosemite 10.10.5 with Boom 2 trial installed, activated and all seem to be ok.. configuration, menubar shortcut aso.. fine. BUT nothing is happening when I change profil between the 5 five default choices (fidelity, pitch..), nothing happen when I try to change volume aso..! I can do what I want, Boom 2 seems to be a "dummy" software. Sound coming out from iMac speakers remain unchanged, absolutely unchanged. What a pity.
Could you please let us know whether Boom2device was selected in the System Sound Preferences?
If you are still facing this issue please mail your query to our Support Team (firstname.lastname@example.org) with the screenshot of the System Sound Preferences. We will be happy to help you.