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No, a soundcard is not typically needed for a DJ controller. The DJ controller has built-in audio interfaces that allow it to connect directly to a PA system, a speaker, or a computer for digital DJing. The need for an external soundcard arises when you want to add more inputs/ outputs, or when the DJ controller doesn’t have a sufficient audio interface for your requirements. It is always advisable to check the specifications of the DJ controller before making a decision.