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I guess everyone is just as curious and clueless as I am about this combo. Seriously....what was I thinking? My Fire/Rad is way cooler. 
On my sonic/kin I'm Soul mastery and have Tactics assault and Venge.
For PvP don't bother...there isn't much use to kins anymore.
Fly and hover are good for travel options plus you can hover out of AoE and melee range and still get a ten stack FS off teh mobs. I take ID on all my kins cause when you need it adn don't have it, it's a pita.
From sonic blast if you don't plan on dumping a bunch of cash into him I took the AoE sleep, the Cone, and my 2 short rech st attacks (RE: Not shout)
The AOE sleep can provide a nice heal if you proc it with the Malaise's Illusion proc and hit about 5-6 foes with it. Plus you can sleep go in FS...it's a good build just takes some skill to get used to.
From Sonic, take the sleep, the stun, Shriek and Scream and Howl (for teams). The nuke is cool too. The rest is season to taste.
The sleeps and stun make soloing PVE content almost trivially easy. I say that based on pre i-15 spawning patterns that would not include bosses except for scripted ones. It seems bosses are appearing more frequently and those powers may no longer trivialize soloing. Dunno, haven't tried much soloing since it came out.
I went the other way with mine. I skipped the sleep and took the KB cone instead. Sure the sleep is safer for soloing, but it's boring that way. I use the KB power for my main mitigation along with the heal. It makes for some hectic play, but to me that's the way it should be with kin.
The KB is sexy but almost nobody ever takes it due to the whole...ZOMG UR RUINING THE SPAWN WTF??? But yea when I soloed it was a lot of fun KB'ing things off of buildings and what not. You can get some KB protection (3pts)and recharge (7.5%) out of that with some KB IO Sets...pretty cheaply at that.
Hello, I have a level 30 sonic/kin corruptor. He's not bad but could be better. So, I have turned to the forums for advice. I'm a 60month vet, have played lots of toons including a kin defender. I am familiar with the kin set, but sonic not so much. I am mainly looking for a PvE build. I want to get to 50, then I'll review my PvP options. I play 50/50 solo vs team. As a defender, ID seemed useless since most people found ways to get status protection and it lasted for so short a time. Same on villain side? At any rate....I know the kin staples: Transfusion, Transference, Speed Boost, Siphon Speed, Fulcrum shift. I don't know what's necessary on sonic, nor do I know what pools are good ideas. I am thinking CJ, Mans, and Tactics. Can't go wrong with fitness if there's room. With all the fire/kins running about, am I missing out by having gone the sonic route?
Sorry, I don't have a build fully planned out to post for review.
Thanks!