Cassp,
No problem with feedback, but this may be because I use a Crown CM-311A headset mic, which is very feedback resistant. Also, my mic EQ settings may have some bearing on the lack of feedback as well.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)