MD -> AR cable?

Hi guys,

Will this cable work for main outs of MD to audio input of AR?

http://www.ghmusic.com.au/hosa-technology-03-ft-y-cable-st-1-4-inch-male-to-2-x-st-male.html

Thanks!

No.
You need a so-called “insert cable”, where two mono plugs go to one TRS stereo plug with Left channel on the tip and Right channel on the ring.