Please read the profile before purchasing. Operation confirmed. SHARK DSP110 Are you looking for feedback control? Are you looking for easy-to-use compression? Or are you looking for signal conversion for acoustic-electric guitars and other line-level instruments? Whether used for microphones, acoustic instruments, or even as a delay line for speaker systems in large venues, the SHARK DSP110 offers a great addition to your live or studio toolkit. Clear sound without feedback. The intelligent "learning mode" allows the SHARK DSP110 to automatically equalize the PA and protect the sound system from feedback. BEHRINGER's search algorithm ensures that narrow, sub-second feedback frequencies are attenuated. Type...Vocals Type...Acoustic Guitar