I haven't tried this, but you might be able to use the built-in windows Stereo-Mix recording "device" as your "mic" in skype. It's not really a "device", just the mixer built into windows and your soundcard. It should mix your webcam's mic in w/ the line-in from the soundcard. Then you can play your bass into line-in(you may need to run it through your zoom).
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I'm using a Logitech cordless head set. If I have a mike then the person gets some weird feedback when I start playing guitar. I also have a problem with the Bass. The low end doesn't transfer well across skype. I generally use my guitar amplifier, since it has more of a high end.
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