Connecting power and audio

Hi friends, I want to incorporate my Seed into a prototype that has a 24V power supply. I think I will use one of these buck regulators:

I have used them a lot and they are quite small and cheap, regulate down to 5V and then connect to Seed pin 39 with ground going to pins 40 & 20, is that right? This has about 3A capacity, it should be enough I think, right? Since the Seed schematic has several pages I wasn’t exactly sure about the on-board regulators, but I think pins 21 & 38 are really power outputs, is that basically right? Then I would connect this same ground from pins 40 & 20 along with pins 16 & 17 for audio in and along with 18 & 19 for the audio out. Sound good?

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