apulSoft have released the v1.1 update of their sample trigger plugin, apTrigga, for Mac OS X. It can be used to replace drum sounds and features sample-accurate replacing, without latency. The update features Audio Units support and a free add-on plugin, spikeGen.

spikeGen is a little pattern sequencer which produces patterns of spikes to be used with apTrigga. Combined, the two plugins act as a one channel drum machine, which make it possible to sequence drums in any VST/AU host sending time information.

A demo (with full version of spikeGen) can be downloaded from their website and you can purchase the full version for $30 USD.