Hi Keith, You'll have to excuse me I can help you but time I'm afraid is a commodity I'm fast running out of. I could say it's relelativley easy but I have lots of years under my belt.
I notice you are using Audacity which is a good free application however when adding an effect like echo you have to wait until the effect is applied ie not letting you hear in real time how a differing tweak is affecting the wave file.
Wavosaur lets you alter efx settings on the fly thus allowing you to apply when and if etc. Looking at the home page at the left hand side there's loads of VST effects plugin's for you to load and use on your file. I have the GlaceVerb plugin myself and it's a really good reverb.
I'm sorry I've no more time to give to you Keith, perhaps someone else can pick it up.
http://www.wavosaur.com/Bri