The problem doesn't seem to be my mic, it's somewhere in the Voice FX, and I'm not sure what I haven't set up properly.
I'm using SAM 4.2.2, with a Logitech USB headset.
I understand "USB Headset" raises a red flag with SAM, but it works fine... once.
The issue is, I can use the Voice FX normally, using either the Push-to-talk or lock feature just fine. However, once I've clicked the "Mic Off" button, my voice will not then record again using the "Mic On" button. If I choose this option a second time-- a few seconds to a few minutes or an hour later, doesn't matter-- the music will fade like it's supposed to, but I cannot record my voice.
It appears to have something to do with the EQ preset I've chosen, which is custom. However, I've also tried deleting my custom preset and using the default, and I have the same problem.
My customer preset (I have a soft voice, the default barely registers my voice): http://i.imgur.com/hzGlCdY.jpg
What the EQ looks like after I've used the mic once, and come back to it after it doesn't work: http://i.imgur.com/jA5Fb0N.jpg
Simply opening the EQ box again seems to "reset" the Voice FX so it will work again, but its an extremely annoying work-around, as it means I have to remember to hit the EQ button in advance of every time I want to talk.
Only one of the other DJ's has had this problem, and he fixed his by using the config dialog box, but it doesn't work for me.
My config dialog:http://i.imgur.com/Ww8xIYW.jpg
The tl;dr: Mic on, works fine, mic off. Mic on again, no worky. Hit EQ, close dialog, mic on, works again. Mic off. Mic on, no work.