I use the sound card for my master output and pre-listen and cue my songs using the headphone jack on the iPad. The software is controlled by both the USB Midi controller and the touch screen. What was most surprising was that the iPad was able to power both. Plug the RCA leads from your playback equipment into the USB audio interface and plug the audio interface into a USB socket on your computer. Always connect to a spare USB port. Connecting to a USB hub attached to a USB port is almost certain to cause audio dropouts.
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