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Recording a podcast with two USB mics on a Windows XP machine


I have been using an USB mic to record my podcast and so far, so good.

I'm planning to buy a second USB Mic, because it's difficult to record two or more persons at a time; but i have been reading that it's not possible to record from two mics on a single machine.

Is that true?, is there another hardware that i need to buy to solve this issue?

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USB microphones are actually digital microphones. I only know of one manufacturer who has crammed a USB input into their analogue mixer. I don't really know of any mainstream USB type mixers (not saying they don't exist).
To clarify, all microphones are really analogue; there's really no such thing  as a digital microphone, only a 'digital' microphone does its analogue to digital conversion in the microphone itself (usually using very cheap sounding A/D converters) and that's how they can give you USB connectivity. I'm guessing you are using headset microphones.
To mix two microphones  you really need to use analogue microphones -- Please don't go "awwww analogue?" because as I've said all microphones start off as analogue devices. There are a number of outboard devices sold under the "soundcard" or "interface" banner that will do the job of mixing your microphones. One very good performer is M-Audio's Fast Track Pro. Even if you invested in an actual analogue mixer you would want it to have either a USB or Firewire output or else you have to go in via your soundcard.
Here's a video on the Fast Track Pro. Note the demonstrator has analogue mics plugged into it (as most professionals use).
Best podcasting is achieved using a large diaphram condensor microphone -- virtually the same microphones that singers use to collect every nuance of their voice with a very sensitive microphone. Then you connect it to a mixer (with phantom power to power it) with a headphone socket so you can monitor every nuance of your voice and practice  sounding like the professional voice over guys.
Alternatively you use an interface like the Fast Track Pro instead of the mixer.
Check out the old Rode NT2 microphone -- beautiful!!
I can't believe I used to sell stuff to the owner, Peter Freedman when he and his dad had a little music store just out of Sydney. Now he's a real big shot leading a world market.
Rode also have a mic called a Podcaster -- but it's USB and that puts you back to your original problem.
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