I would see if Ardour has that among it's tools.
http://ardour.org/

Otherwise, Audacity with gverb would probably do what you want.

Dave



On Mon, 2012-11-19 at 21:38 -0600, JMJ wrote:
> Greetings!
> 
> Here's my set-up:
> Fedora 17, 64-bit, Kernel 3.6.6-1
> KDE desktop
> Intel 4300 CPU (dual core @ 1.8GHz)
> 2 GB of RAM
> plenty of hard drive space
> Audio card:  Ensoniq  5880B (PCI)
> 
> I'm using this system to stream audio to the internet.  The audio 
> consists of me singing along with "karaoke" tracks stored on this box. 
> More info on the software used to create the audio:
> 
> = Using the "Phonon Gstreamer" audio backend
> 
> = VLC plays the "karaoke" file (merely an OGV, FLV, or MP3 that includes 
> music and video of the scrolling lyrics)
> 
> = I use "XFCE4-mixer" to mix the music and voice input
> 
> = "Broadcast Using This Tool" (aka "BUTT") is used to generate the audio 
> stream from the mixer output.
> 
> = Voice input comes from an external mic, plugged into the MIC input of 
> the sound card.
> 
> So... what is my objective?  All I want to do is add reverb to the audio 
> input, but not the music.  It seems that it should be fairly simple, but 
> I haven't been able to find that magic combination of 
> software/hardware/settings to make it work.
> 
> I've got JACK and various JACK-related applications installed, but 
> haven't been able to get it all patched properly.  I'm willing to change 
> any/all of the applications I'm using, provided none of the existing 
> functionality is lost.  (I'm aware that a low latency kernel might be 
> needed.)    I'd even change sound cards if necessary, provided that the 
> alternatives are cheap.
> 
> Does anyone have any suggestions on alternative applications, or on how 
> to get these existing parts to play nice with each other?
> 
> Thanks for any/all advice you can offer!!
> 
> JMJ
> 


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