So I need some advice on how to make my singer's sound a little better. It's not actually my singer, it's my girlfriend and we have a little duo project that we've been writing songs for. We don't have much cash and as of late she has just been singing with her mic plugged into a keyboard amp, though the amp has no mixing options besides "high" and "low." We'd especially like some reverb... So should we get a small mixer to go between mic and amp or something else? I don't know anything about mic'ing singers or live sound...I just play the gee-tar! Some reliable and affordable product recommendations would also be much appreciated!