usb sound "cards", network adapters, and deneb

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I have a 2000 with a 68030 board and a deneb.  I'm planning to attach a keyboard, mouse, and flash card reader, all of which I think should be no-brainers.  But I worry about the network adapter and sound card.

For the network adapter, do they all work?  Or do I need a specific make and model with the right chipsets?  Is there a tutorial out there somewhere for this?

And for the sound card, same question.  What's inexpensive that works?  Do any have a dsp that would allow mp3 playback?  What software out there could take advantage of a usb sound card?  I've only done protracker type software for the amiga.  Is there more complicated software that would have more than 4 channels for example?

Also, what about usb joysticks/game pads?  can they take over the db-9 port and act as if they're installed there?

brian

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Thanks to everyone who replied.  

For my 1200, maybe instead of using a usb keyboard and mouse (via subway), I should use something like the lyra and cocolino?  That way the amiga has no choice but to use the new keyboard and mouse, even if I boot from a floppy.