Hi!
From what I understand, the U of A converts each percentage or letter grade to the 4.0 scale and then averages them together. For example, if you had 20 A's for your most recent 20 3-credit courses, it would be 20 x 4.0 = 80.0 Then 80.0 / 20 courses = 4.0. From what I remember, I also think that marks on exchanges are considered, but I'm not sure. I was also worried about having enough research experience/volunteer experience. I only had a few hours of research experience from one of my classes, but I was accepted as a first time applicant. Although research experience is advantageous, it doesn't seem to be necessary if other areas of your application are strong. I really focused on the academic side of my application. I heard that the prerequisite courses are indicative of how well you will do in the program, so I really focused on trying to get A's in each of them. Although I didn't do any internships and did not have a reference from an SLP, I tried to get as much volunteer experience as I could in related fields such as at schools and clinics.