When the OnStage speakers first came out, the charger was not compatible with 3g iPods or iPhones. Newer speakers have an upgraded charger and will charge all current iPods/iPhones (up to and including iPhone 3Gs)
Bad news is that there's no way to upgrade an old OnStage.
You can test yours by trying an iPhone 3G (if you have a friend with one, for example) to see if you have the old or the new charging circuit.
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