Neither are true, I use it with stereo samples often with no problems, and it allows up to 9 samples that you can cycle through randomly, or in round robin, or you can separate them into 9 velocities and make it velocity sensitive.
The ONLY thing it lacks that Drumagog can do is combining the velocity sensitive modes and multisampling modes. So like, in Drumagog you set it up for light, medium, and hard velocities, with 5 samples per velocity say as an example. apTrigga can't do this, it can only do multisamples at a single dynamic level. So if you set it in "Random" mode and load 5 samples, it will cycle between those 5 samples randomly regardless of what volume the audio is coming in. It does have velocity tracking so it will play the sample quiter or louder depending on the incoming audio and all of that is configurable, but it's playing a HARD sample quieter, not playing a quiet sample at it's intended volume, know what I'm saying?
Alternatively you can set it in dynamic mode and you can set up up to 9 layers, but only one sample per layer. Kind of a bitch, but I've found that I don't really need things to be velocity sensitive like that honestly. 99% of the time you want everything to be a full volume sample anyways, and listening to your stuff I haven't really noticed you triggering any soft samples. If you needed to you could go back and put them in manually.
But yeah, that's the only limitation.