I've been successfully using a StudioLive AR16 USB connected to an iMac for over a year. Yesterday it worked ok, this morning I have a problem.
With nothing connected to the mixed except speakers and power cord, and all sliders at their lowest level - then with MAIN moved beyond unity there is a faint pulsing sound - at about 8 beats per second.
With the MAIN level low (e.g. 30) the pulsing cannot be heard, but if the level for ST17/18 is advance to 30 the pulsing can be heard much louder than before. No other channels make any difference.
When the pulsing can be heard loud, changing USB/SD Card from USB to "SD Card" appears to make the pulsing go away, but if you then increase MAIN towards maximum the pulsing returns, but much more quietly.
If the mixer is turned on while attached by USB to the iMac, the computer does not recognise it.
Has anyone seen this behaviour before? Is there an easy fix?
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