Finally I've built a stereo Electret Microphone using this great Greenmachine tutorial. I ended up not using the WM-61A instead I used a no-name brand that sounds pretty good. I don't own a mini-disc, I use a Boss Micro BR 4-track recorder by BOSS/Roland and it works excellent. You can check my results in Micro BR review with sound samples and on Wich Microphones for Micro BR Line IN. Greenmachine: Thanks for the tutorial. The recorder (Micro BR) is very good and works great with the Stereo electret microphones. (You asked me this about one year ago... )