Keep rate constant regardless of pitch in Padshop?

Does anyone know how to keep the duration of grains constant regardless of pitch. Many of my samples are rhythmical. As I play lower keys, it plays slow. As I play higher keys, it plays fast. Any way to shift pitch without slowing down?

Also any way to define multiple locations? For example I want the grains to start on the beat, and never between beats. Ideally I could define this manually, bc often is not a standard tempo.

Would be much obliged for any hints!