Its a pretty solid combination.
You have sirens song, so you can sleep most of a spawn and then take down the bosses that are still standing. Then you can use amplify, concentration howl and psychic scream to mow down the minions leaving very weakened lts.
How has it been working for you
Resistance and regen debuffs, very nice for lategame TFs.
Take siren's song and use it before every group. It's very nice for stting up drain psyche and shockwave...err, psychic shockwave that is... you don't want shockwave. But after that, jumping up and howling or psychic screaming them is very nice to wrap things up as previously stated.
Just made this toon and I'm wondering how well it will fair post lvl 50 compared with other blaster