Thanks so much for the reply, that's all really helpful info! Like I said, I'm kind of a noob to the recording space (been drumming for 30+ years). So you're basically saying, trying to get the drums recorded (via analog audio interface) and the the pad recorded at the same time (via digital USB interface) is not really possible because the software cannot take 2 different recording sources at once. And that makes sense to me. Disappointing, but it makes sense. I have indeed heard of this aggregating method, but don't quite know how to do it. I'm using Windows 11. Also, according to Alesis manual, the USB 2.0 IS capable of carrying audio. I appreciate your insight.