As always: a capable drummer, an experienced engineer and a decent studio space will help you make the most out of Drumatom. Our technology is designed to work well in most typical scenarios.
However, when your drum recording contains excessive amounts of leakage, or when your recorded track contains a very small number of drum hits (as typically happens for example in the case of toms), it's practically impossible to perfectly identify the main sound.
If you want to make an analogy, think about a de-noise tool: the performance of the tool depends on the type and level of noise. Quiet studio conditions will not produce the same results as noisy live recordings.