Other classes probably deal with it just as much, but I am getting really tired of listening to myself wrestle with the universal cooldown. The continuous fizzle noises and spell not ready spam are melting my brain. Is there any mod out there or method for muting the sound and suppressing the error messages?

You can suppress the error messages with frame hide/show messages and you can suppress error speech with a Cvar, but there's no (non-file-replacement) way to suppress the "clunk" noise you get for fizzle.

Spam-wise, check out SpamIAm, configurable spam suppression; I think it's TBC compatible.

The old FastCast mod used to do this, I've been looking for a replacement as well

ErrorMonster is what you're looking for.

So ErrorMonster disables that gong-like sound when attempting to click a trinket that is on cooldown? (The macro I have already disables the center-screen printed error text.)

Just tried it. Only the text.

Actually I'm quite certain you can use the default UI to take care of the character error speech. Most raiding Rogues would go nuts without being able to disable that.

Why do you have sound on in the first place?

I can literally count the number of times I turned sound on since I began raiding on my first character.

1) Listen to the music in Magmadar cavern.

2) Hear the Majordomo and Ragnaros speeches once each.

3) Hear Vael and Nefarian speeches once each.

4) Hear ZG music briefly.

4) Hear AQ40 music briefly.

5) Hear Naxx music briefly.

6) Blood Elf newbie area for about 5 levels (longest ever time with music on in 2 years).

7) Nagrand for the Thrall "event".

Heck, most boss emotes if I've heard them at all it's over vent while other people talk (that's also the only way I ever heard that irritating "tank has died" sound from CTRA).

So yeah, turning sound off completely definitely works to stop error messages, ability not ready messages, and all the other stuff that gets in the way. If there was a way to knock out all the UI sound effects and just keep background music and boss emotes, let me know... I'm happy to get the music back more often, but hearing all the sound effects of the fight would just be overwhelming.

I would have thought this was possible from the default sound menu, just moving the effect's slider all the way to the left and the music slider to a volume you are comfortable with.

There is also a check box in there to disable the audio error messages but it doesn't effect the GCD one.

I have tried playing with no sound but it doesn't work for me, I find I use the audio cue's for reacting to many things.

Yeah, this one would get me the music, but TBH the music doesn't interest me that often. It's more being able to hear spoken dialogue (boss emotes and voice emotes) that I want to be able to hear without turning everything else on too.

Come to think of it, there IS one other sound I really miss. Stealth sound. But generally if I can hear the sound it's either too late or I can see the person anyway, and I don't PVP so much these days.

I think this one's one for the Blizzard UI board: give us more options for micromanaging sound.