I just purchased a RCA VR5330R digital voice recorder. You can set it for Dictation or Conference mode, and you can set the sensitivity for LO MED HI. With the Automatic Voice Recording (AVR) on, it works great with one-on-one secenarios.However, in shops such as casinos the background noise is such that the recorder stays on. Maybe a good external microphone would work, but then you have the problem of concealment. I suppose a high-tech ($500?) would work, but can't justify the price. Ideas? Thank you.