this is real 'recording on the cheap', I'm trying to capture an accurate room sound (assuming everyone miced and going thru the mixer). - I'm playing with an old PC to try to record the output signal from my bands powered mixer. Of course the sound card on the PC is nothing great, so I tried hooking up an old Plantronics USB headset interface - it's basically a small sound card on the USB cable with 2 ports; external mic-in and headphones out. I attached an old Creative multimedia mic and the sound is crytal clear sharp. No noise at all and no distortion. I then attached a Shure SM-57 and I get no signal at all. I think the plantronics external mics use an electret mic which has built-in power. The Shure SM-57 being a dynamic mic has no built in power. So, my questions are; 1. Do you have to use a powered mic with a USB interface? Like a Condensor mic with phantom power? 2. Will a powered mixer work with such a device - taking the tape out from the mixer and plugging it into the USB mic-in on the PC?