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Success, and the issue was something in this combination doesn't like my new mackbook retina possibly due to USB3.0 ports, switched to an old windows netbook and worked first time.

verbose output: avrdude -P /dev/tty.usbserial-A600HA0E -p m64 -B 100 -b 19200 -U flash:w:/Users/colin/Downloads/gruvin9x-frsky-nospeaker.hex -c avrisp -v avrdude: Version 5.3.1.osxintelhack, compiled on Feb 1 2007 at 22:30:12 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ System wide co...

checked and rechecked connection and pinout multiple times, have continuity from pins on 9x atmel to arduino, any advice ? error: avrdude -P /dev/tty.usbserial-A600HA0E -p m64 -B 100 -b 19200 -U flash:w:/Users/colin/Downloads/gruvin9x-frsky-nospeaker.hex -c avrisp avrdude: AVR device initialized and...