I do not own a M:S but for that you need a gate mode, so when you release the key it cuts the sound. According to this can not do that with the pads but with a midi keyboard should work.
In the Samples you should try single cycle waveforms as a sound source.
I am using the Model: Cycles as a polysynth via ableton and max4live
Same method should work with a midi round robin box like midihub