I make beats

I have a relatively short 808 sample that I want to turn into a sub. Are there any inbuilt features in cakewalk or any plugins that can do this ? Whenever I try this I end up with a very clicky sample since its almost impossible to loop a short wavelength without any features.

This problem has been annoying me for a while... If I load multiple Komplete Kontrol's onto the same input channel, the samples will overlap. If I have a snare and a hi-hat routed to the same input channel, if I click on the snare or open the sampler, the snare will play the hi-hats and the snare's notes in the midi unless manually open the sampler for the hi-hats or I change the input to one of the 16 options. I use the "all external inputs" option since I am not currently using any midi instruments. For some projects, I need more than 16 samplers though, so is there a workaround to this?