An electronic gas blender system includes a pressurized oxygen supply connected in-line to a first proportional valve, a first check valve and a first flow sensor by a first circuit of gas lines, a pressurized air supply connected in-line to a second proportional valve, a second check valve and a second flow sensor by a second circuit of gas lines, and a port disposed between the second check valve and the second flow sensor on the second circuit of gas lines for providing airflow access to a low pressure source. The port includes a plug configured to open and close the airflow access, and a control module is electrically coupled to the first proportional valve, the first flow sensor, the second proportional valve, and the second flow sensor. The electronic gas blender system can be used to blend two high pressure gas sources under dynamic control or one high pressure and one zero or low pressure gas flow source through a slave/master relationship.