Does your video recorder have an audio in?
Generally, videos shot using speakers and the built in mikes sound inferior, what with being played though sub-standard speakers, and the room acoustics being picked up and coloring the sound badly.
If your video recorder has any kind of stereo mike/line in jacks, take the direct output of the arranger or mixer and feed that to the video recorder. It will sound night and day better than the mikes.
Take the time to make sure you are not overloading the inputs, listen carefully for any distortion or 'pumping' in levels, as the camcorders auto volume leveling messes with the signal.
Alternatively, if you have a digital recorder (one of those cheap Zoom recorders works well), shoot the video using the mikes, but run the Zoom at the same time. Then, in the computer, use some video editing software to throw away the camcorder's audio, and fly in the Zoom's audio to replace it with.
I think Frank used this system when he made some of the first user demos of the Audya.
It's always well worth checking, if you haven't bought a video recorder yet, that it has aux audio ins of some kind. As musicians, getting good audio onto our videos is FAR more important than a bunch of fancy video features...
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An arranger is just a tool. What matters is what you build with it..!