Bard AoE Dot stacking

[Stoggieman]

Ok, I'm rolling my toon tonight, and know that my solo toon will be my bard while my duo will be a necro. That's a different thread though.
This one has to do with how much damage per tic should I expect when twisting CoD and DDD in an AoE solo mass killing spree? I'm looking at the viability of this at lvl 18, and at level 2 for that matter...
And from what I have gleaned from the boards I should do this with either a lute or brass instrument in hand, which makes sense as drums for selos wouldn't help with the speed of the kill just with the speed of myself...

So which instrument in hand? Should I be swapping instruments, like I did on live LOOONG ago, keeping one on my mouse or as the diagonal "circles" are being performed is this not a viable option?

Lots of questions, I'm sure lots of answers.