Convolution reverb is the way to go for this! Theres a free convolution reverb VST out there (maybe a few' date=' but can't remember what they are) and plenty of free impulse responses, everything from the norm to the total bizarre, impulse responses of pipes, people's mouths, garbage cans, kids echo mics, etc.. up to opera houses, stadiums, famed recording studios, it's very believable aswell, the cleaner your signal (ie. close mic'd as possible) the better it can work.... Heres the freebie... [url']http://www.knufinke.de/sir/download.html (EDIT: Getting mega latency with this thing, I'm using ALtiverb usually, works in real time) And heres free impulse responses... http://noisevault.com/nv/ http://www.echochamber.ch/responses/index.html The impulse responses (if you don't know) are basically samples of a sound in a space, and the reverb processor sort of analyses the generated wave form and is able to emulate the ambience with whatever signal is being passed through....don't take that as gospel but thats as best as I can describe it. Check it out though, no more fizzy guitars! I use it just for playing along at home sitting with headphones sounding like you're ripping it up in the Albert Hall...