I just wanted to express my thanks to the developers of Hydrogen. Even with the lack of editting funcitonality, I find this tool indispensible.
Recently I exported a song to separate tracks and pulled them all into PreSonus Studio One (free version). Simply adding appropriate channel strips for EQ and Compression, the results are amazing. I saved the mix as a stero WAV and import into a Zoom R16 prior to recording other instruments. As long as tempo and form don't change, it is possible to build up a track, change the drums in Hydrogen and re-import them to the Zoom. Everything can also be mixed in a DAW (including the separate drum tracks.)
Using level and pan for each drum in Hydrogen also make a huge difference and is very easy.