Uhm, I think you don't get it guys.
Let me explain it further.
Yes I am a computer engineering graduate. But I didn't pursue the career path it should have taken me. Instead, I am running an internet cafe/computer shop and a sound system rental business. At the same time, I am the acting SOUND TECHNICIAN of my sound system rental business. Anyone can become a sound technician through experience, especially when you have a passion for music or through studying. Most of the sound technicians in my country earn that title through experience only. But if you complete a sound engineering program, you will become a SOUND ENGINEER, which is superior than a sound technician obviously.
I think the VO was convinced about my study plan. If it was the other way around, the VO should have stated in the refusal letter that my proposed studies are not reasonable in light of one or more of: my qualification, previous studies, employment, level of establishment, other educational opportunities available in the Philippines or Canada, language abilities, or my future prospects and plans.