What an incredible deal...no steal this was. I even had to add a sample pack to be able to buy this software. Luckily I had every other AIR product except from these two beforehand, except for the daw. I didn't use DrumSynth 500 yet but the Boom is really the BOOM! Everything I expect from a Drummachine just in a software version, ticking out of the boxes! :) Works great and comes with clear sound. It has not so many presets compared to the Transfusor, but it is capable to get your track grooving instantaniously. Thanks a lot! KVR/AIRmusictech enyoing your products when I can.