Audio problem with firewire to thunderbolt adapter

I am running four channels of audio from a Yamaha Motif synthesizer into a new iMac using the firewire to thunderbolt adapter and recording to Logic.   I get very loud distortion.  I unplug the same cord and remove the adapter and run the same audio into my 2011 MacBook Pro and record the audio with no distortion.  I can run MIDI into the iMac using the adapter with no problem.  What gives?

The iMac has three USB and three Thunderbolt.  The Yamaha has Firewire out which carries 16 channels of audio.  It works great with my MacBook Pro, but the Thunderbolt Converter seems to mess it up.  It's fru
strating having bought a brand new iMac and not being able to use it to record.  Now when I try to record a single channel of piano, Logic starts blinking on and off, alternating with whatever window is behind it.  This is doubly frustrating.

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