Possible to change start end increments of Toraiz sample editor?

So far I've been able to make large jumps in the start or end point using the knobs sans shift key or tiny increments in concert with the shift key. Those aren't sufficient to accurately trim a vinyl sample to a bar, especially when the sample is a different BPM than the current project. Am I missing something or is there no way to refine the increments to accurately trim?