Dulce Audio Player

I am trying to get some color harmony with the audio player and the overall design and am hitting a wall. The primary colors are brown, orange, blue and white.

I've tried different tints of blue and orange for the scrubbers, but that is not working. This version, the scrubber looks a bit dull. I am thinking I may need to introduce another color, (yellow/gold?) but that might be color overkill. Thoughts?