Sonic is a very nice secondary and is very underated. Played a sonic corruptor with my mates brutes and with a friendly kineticist we made an amazing trio (kinetics and sonic have very good synery as they fill the gaps in each others powersets ie sonic has -res, & res shields and kinetics has +damage and healing).
Your power choices are pretty good just a few things I would change, I would definately take aim ahead of Rain of Fire for end use as much as anything you also want aim to make inferno as damaging as possible. Liquefy is not a nice power mainly due to the recharge and you will get much more use out of Soul Drain which is more +damage to go with your -resistance. Personally I wouldnt bother with cage for a PvE build but possibly be nice for the RSF if you want to try it probably skip the hold.
This is what I would do for a PvE Fire/Sonic using SOs (for stealth earlier than 38 do some patrol missions in PvP zones for the temp stealth pack in Bloody Bay and the temp invis from Sirens):
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Exported from Ver: 1.7.6.0 of the CoH_CoV Character Builder - (http://sherksilver.coldfront.net/index.php)
---------------------------------------------
Name:
Level: 50
Archetype: Corruptor
Primary: Fire Blast
Secondary: Sonic Resonance
---------------------------------------------
01) --> Fire Blast==> Acc(1) Acc(3) Dmg(3) Dmg(5) Dmg(5) EndRdx(25)
01) --> Sonic Siphon==> Acc(1) Acc(7) Rechg(46)
02) --> Fire Ball==> Acc(2) Acc(7) Dmg(9) Dmg(9) Dmg(11) EndRdx(11)
04) --> Sonic Barrier==> DmgRes(4) DmgRes(13) DmgRes(13)
06) --> Swift==> Fly(6)
08) --> Air Superiority==> Acc(8)
10) --> Hurdle==> Jump(10)
12) --> Aim==> Rechg(12) Rechg(15) Rechg(15)
14) --> Fly==> EndRdx(14) Fly(17)
16) --> Disruption Field==> EndRdx(16) EndRdx(17) EndRdx(19)
18) --> Blaze==> Acc(18) Acc(19) Dmg(21) Dmg(21) Dmg(23) EndRdx(23)
20) --> Stamina==> EndMod(20) EndMod(25) EndMod(27)
22) --> Sonic Dispersion==> DmgRes(22) DmgRes(27) DmgRes(29) EndRdx(29) EndRdx(31)
24) --> Sonic Haven==> DmgRes(24) DmgRes(31) DmgRes(31)
26) --> Fire Breath==> Acc(26) Acc(33) Dmg(33) Dmg(33) Dmg(34) EndRdx(34)
28) --> Aid Other==> Heal(28) Heal(34) Heal(36) IntRdx(43) IntRdx(45) EndRdx(45)
30) --> Aid Self==> Heal(30) Heal(36) Heal(36) IntRdx(37) IntRdx(37) EndRdx(37)
32) --> Inferno==> Dmg(32) Dmg(39) Dmg(39) Rechg(39) Rechg(40) Rechg(40)
35) --> Clarity==> Rechg(35)
38) --> Stealth==> EndRdx(38) EndRdx(40)
41) --> Soul Drain==> Acc(41) Acc(42) Rechg(42) Rechg(42) Rechg(43) EndRdx(43)
44) --> Dark Embrace==> DmgRes(44) DmgRes(45) EndRdx(46) EndRdx(46)
47) --> Soul Storm==> Acc(47) Acc(48) Hold(48) Hold(48) Rechg(50)
49) --> Summon Mistress==> Acc(49) Acc(50) Dmg(50)
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thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
Thanks for the advice there it's nice to know im on the right tracks at least. Much as I like to find out for myself what powers suit etc. its nice to have a vague plan at least! 
As for the stealth power, that is for the toons concept. So it has to stay. A waste of a pool power i know but i wanna keep the concept on this guy.
Interesting that the sonic cage has not been tried on LRSF, as most of the ones I have done recently the pulls have always brought 2 people. So i thought if i could just perma hold one of them everyone else could wail on the other. Will have to look into that one.
Any other advice would be much appreciated. But as not alot of other people seem to know about the sonic secondary, so I will try and post up some feedback on how the powers perform just to let anyone else, who is interested in the set, know how it performs as information on it is lacking at the moment!
Once again cheers for the input Phil 
My point about stealth was that you cant really fit it in before 38 not that you shouldnt have it
good luck with the toon 
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
[ QUOTE ]
Interesting that the sonic cage has not been tried on LRSF, as most of the ones I have done recently the pulls have always brought 2 people. So i thought if i could just perma hold one of them everyone else could wail on the other. Will have to look into that one.
[/ QUOTE ]
Actually, IIRC you need 3-4 applications (from different people) to be able to cage ONE, and that's not perma.
I've managed to get my pure Sonic Attacks/Resonance to lvl 49. I've just picked up my final power, Disruption Field, and of all the secondaries it's probably the most effective one I've seen! So far I've only tried it with by casting it onto an MM's drones. And it rocks! I think this'd be devastating on a Brute as it cuts through the opponents defenses like swiss cheese. The only problem is it is massively expensive to run, just like Sonic Repulsion.
Union: @Ban-Sidhe
I've no experience in either but from i perosnally know, it would seem you have quite a balanced build there stretch.
Only thing i'd do is swap blaze and stealth around for slotting purposes. Aside from that should be good. Starbarricade will be amused.
[ QUOTE ]
I think this'd be devastating on a Brute as it cuts through the opponents defenses like swiss cheese.
[/ QUOTE ]
FEAR THE AWESOME SWISS CHEESE!!
SingStar:
"Extremists LOVE to fish to get us annoyed so we break the forum rules."
CRACK68:
"The origin of life wasn't planned either, should all life be declared a bug and wiped out?"
Lionsbane:
"You know me.Ever the realist"
Hey! Don't knock it until you try it!
Union: @Ban-Sidhe
[ QUOTE ]
I've managed to get my pure Sonic Attacks/Resonance to lvl 49. I've just picked up my final power, Disruption Field, and of all the secondaries it's probably the most effective one I've seen! So far I've only tried it with by casting it onto an MM's drones. And it rocks! I think this'd be devastating on a Brute as it cuts through the opponents defenses like swiss cheese. The only problem is it is massively expensive to run, just like Sonic Repulsion.
[/ QUOTE ]
It would appear that disruption field kicks some serious behind!! I've only tried on a few missions so far but all minions and Lt's go down after just a few hits. As for bosses they dont cause too much of a problem either atfer stacking disruption field with Sonic Siphon.
This is exactly what I wanted from this power and I think the fire primary will come into its own after stamina and SO's, rather than being the debt boy that I currently am! I can't believe that people have overlooked this set as being one of the best for brutes. Usually all you hear about is kin this and cold that. But I think sonic has the potential to be the brutes new best friend. Not only for the debuff powers but also for the shields and mez protection.
Ill keep ploughing on and putting updates on how I find the set and hopefully ill be able to make some form of guide when I get upto a resonable level.
[ QUOTE ]
But I think sonic has the potential to be the brutes new best friend. Not only for the debuff powers but also for the shields and mez protection.
[/ QUOTE ]
(my highlights)
Not many Brutes need mez protection, is the problem with that. 
The occasional few instances in CoV where you get hit with fear or confuse can be remedied by a BF - or in most cases, just by waiting it out. Kin, Thermal, and Cold will always be a Brute's best friend because they provide more than just a res shield and occasionally-useful mez protection - don't get me wrong, I love the set (and have an Ill/Sonic 'troller and a Rad/Sonic Corr), it's just that whilst /Sonic's not a bad partner for a Brute by any means, it's far from the best.
Personally, I'd much rather have a Sonic on my team when playing on Corruptor-heavy teams - Sonic Dispersion really comes into its own when you need a little more survivability and mez protection.
@Synaesthetix
"Here, take some more bees with you. You may need them."
Union: FU//LoUD
"that Syn is that that" - Mothers Love
Just doing a quick few figures on Red Tomax with the res of the Sonic set and found something interesting out. Sonic Barrier and Disruption Field works out (when fully slotted) to give a 42% res to smashing lethal damage. This added onto a brutes smashing / lethal damage res (generally 42%) works out at 84% res to smashing / lethal damage. That surely can't be ignored?
I don't claim to be completley up to scratch with the figures but if the brute then took Tough he would be at/near the res cap for this type of damage. Would this be about right?
[ QUOTE ]
Just doing a quick few figures on Red Tomax with the res of the Sonic set and found something interesting out. Sonic Barrier and Disruption Field works out (when fully slotted) to give a 42% res to smashing lethal damage. This added onto a brutes smashing / lethal damage res (generally 42%) works out at 84% res to smashing / lethal damage. That surely can't be ignored?
[/ QUOTE ]
Sorry to say, but for most of the game it pretty much can be ignored - having resistance up near the caps is great, but you can and will get by on much less with a Brute. Whilst it's nice to have it's not at all necessary, nor will it speed you up that noticeably - unlike having a Kin around. In the few instances where you do need more survivability, it's usually better not to be hit than to have greater resistances (LB -res grenades, for example) - /Cold - or if you are hit, for there to be someone around able to heal you - /Thermal.
Is /Sonic useful for RSFs/LGTFs? Very much so, but not primarily for the benefit of the Brutes on the team.
Like I said, please don't misunderstand me: a well played /Sonic will benefit any team, just don't expect every Brute on the server to be knocking down your door.
@Synaesthetix
"Here, take some more bees with you. You may need them."
Union: FU//LoUD
"that Syn is that that" - Mothers Love
[ QUOTE ]
Like I said, please don't misunderstand me: a well played /Sonic will benefit any team, just don't expect every Brute on the server to be knocking down your door.
[/ QUOTE ]
Sorry it was probably me not being clear, but I can understand that Kins and Colds will always be the Brute's perfect partner, but its nice to know looking at those figures that sonic is definetley a helpful set and not the gimp set that so many people make it out to be.
But I really appreciate the advice so far Syn, has been really helpful. Ta!
A /fire brute and /sonic corr is a great partner ship the -res from DF is great especially since a fire brute has fury and fiery embrace so +damage isnt that vital. Playing with my brothers elec/fire with a kin corr and a sonic corr is a great sight
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
I agree. Sonic corr is best served in a team, where the buffs can be of most use. Plus you can't use a lot of the secondaries on yourself (Bit of a dissapointment, but hey!)
Everyone says sonic's are few and far between. But they are worth it It's always nice to hear though. It does our Sonic ego's good.
Union: @Ban-Sidhe
[ QUOTE ]
Everyone says sonic's are few and far between. But they are worth it
[/ QUOTE ]
Aye this was my original inspiration to try this set and I have to say it looks pretty good to me. I think what puts most people off is as you have already said, not alot of the powers are usable without a team, or certainly not until the later powers.
But I think once i get past the hurdle of stamina there's not gonna be a lot of stopping this toon. Really looking forward to the end game.
Working on my new pet project as I haven't seen many corr's with a sonic secondary. What I would like to know is if anyone has much experience with the powers and how good of a set it is. Planning on a purely PvE build for teaming with a brute buddy.
Choose fire as the primary and my current build so far is:
+---------------------------------------------
+ Built with SuckerPunch's Online Planner
+ http://www.cohplanner.com
+---------------------------------------------
Name: Phantom Shreiker
Level: 12
Archetype: Corruptor
Primary: Fire Blast
Secondary: Sonic Resonance
+---------------------------------------------
01 => Sonic Siphon ==> Empty(1)
01 => Fire Blast ==> Empty(1)
02 => Sonic Barrier ==> Empty(2)
04 => Fire Ball ==> Empty(4)
06 => Rain of Fire ==> Empty(6)
08 => Fire Breath ==> Empty(8)
10 => Swift ==> Empty(10)
+---------------------------------------------
01 => Sprint ==> Empty(1)
01 => Brawl ==> Empty(1)
02 => Rest ==> Empty(1)
Is it worth getting sonic cage at any point maybe to help contain any problem pulls with the LRSF? Or is it just an intangability power that i should avoid like the plague?
Sonic seems like it has massive potential, but I just wanted to know which one's are the WOW powers and which one's are skipped. This was an idea of my final build. Any advice appreciated
+---------------------------------------------
+ Built with SuckerPunch's Online Planner
+ http://www.cohplanner.com
+---------------------------------------------
Name: N/A
Level: 50
Archetype: Corruptor
Primary: Fire Blast
Secondary: Sonic Resonance
+---------------------------------------------
01 => Sonic Siphon ==> Empty(1)
01 => Fire Blast ==> Empty(1)
02 => Sonic Barrier ==> Empty(2)
04 => Fire Ball ==> Empty(4)
06 => Rain of Fire ==> Empty(6)
08 => Fire Breath ==> Empty(8)
10 => Swift ==> Empty(10)
12 => Air Superiority ==> Empty(12)
14 => Fly ==> Empty(14)
16 => Disruption Field ==> Empty(16)
18 => Health ==> Empty(18)
20 => Stamina ==> Empty(20)
22 => Sonic Dispersion ==> Empty(22)
24 => Stealth ==> Empty(24)
26 => Blaze ==> Empty(26)
28 => Sonic Haven ==> Empty(28)
30 => Aid Other ==> Empty(30)
32 => Inferno ==> Empty(32)
35 => Clarity ==> Empty(35)
38 => Liquefy ==> Empty(38)
41 => Aid Self ==> Empty(41)
44 => Dark Embrace ==> Empty(44)
47 => Soul Storm ==> Empty(47)
49 => Summon Mistress ==> Empty(49)
+---------------------------------------------
01 => Sprint ==> Empty(1)
01 => Brawl ==> Empty(1)
02 => Rest ==> Empty(1)