volume and tuning

Having two kids, one in full fay kindergarten who needs more the 10 hours sleep a night, I realized I wasn't going to get much playing done if any. While still waiting for the dinda I went and ordered a triple bass c from the tabao vendor called "bull" (his mark looks like a bull). Around this time I got the song yeonriji and its backing track. Trying to play this with the plastic triple I noticed I was still playing flat. And I couldn't sustain the effort needed to play it in tune with the track. When I got the dinda...same thing!