To answer the rest of your question, no, you should not use the recorder's plug-in power (unless the recorder has been specially modified to power these mics). Instead, you should get either one of the Church Preamps (the 9100 is better; has more gain settings) or just get a simple battery box. The preamps are around $129 I think; battery boxes can be had for $60 or less. Some people feel that using one of the pres yields higher quality recordings because the electronics in the pre are better than those in the Edirol (very likely true); though it is worth pointing out that if you are recording amplified rock music, you may not hear much of a difference.