Since you are a Mac user, I'll assume that you use Logic (?).

There is a function in Logic that will map the drum transients (somehow) and allow you to add a snare sample to each of the snare hits (exactly matched timing) - or Kick if that is what you are after.

I am a Studio One user (Windows), so I am not familiar with the specifics, but Bud (of Janice & Bud) uses this function regularly and can explain it. If he does not see this thread you could PM him and ask...


Optionally - what I sometimes do - is simply drop a snare sample into another track in your DAW and add it everywhere the snare (in the RealDrum track) hits.
In my case, the snare will copy (duplicate any number of times) pretty close to the snare beat and then I expand the tracks significantly to move the sample to the exact timing. It takes about 30-40 minutes to do that - which some might find tedious, but you only have to do it once for a recording that will last for as long as you choose to keep it.