Owing a tube amp for the first time without built-in reverb has made me consider the alternatives. What's the pros and cons of using a pedal for reverb (vs. an amp's own or a post-amp effect)? Are there even great reverb pedals around? I'm thinking adding at least one tube stage after the reverb will screw any notion of 'natural' or 'open' sound, but then that's not always what one's after. Pardon my ignorance - any advice appreciated.