Kick&uptheVolume& Logic!automatically!assigns!MIDI!CC!7!to!volume!of!the!current!track!that!you!have! selected.!This!means!that!the!Level!knob!on!your!Keylab!will ... 2 thoughts on " How To Open Logic Pro 9 In 64-Bit Mode " lee pashley. February 19, 2010. Opening in 64 bit stops me from bouncing track in MP3. Fixed this by going back to 32bit. Reply. Graham English. February 19, 2010. Yeah, this is a known limitation of running Logic in 64-bit mode.