I only just discovered that you can have multiple outputs from Hydrogen instead of using a simple stereo output. This means that in Ardour, you can have a different track for each drum, i.e. separate tracks for the snare, and kick drum. You might be asking: ¨What on earth is the point of that?!¨ Well… this provides versatility when mixing down and mastering your final song. Often when you adjusting the volume levels of drums without other instruments, you will get it wrong. If you recorded your drums using a stereo input, you have little control, but if you record with multiple tracks you can edit each drum´s volume at any time. i.e. your toms can be brought up whilst your cymbals are pushed down.

This can be done in Hydrogen as follows. Go to File, Preferences select Audio System and click the box which says: Enable Track Outputs. If you now go to the connect tab in JACK, you will see many outputs under the Hydrogen heading. Each output represents an instrument in Hydrogen and can be connected to the track inputs of Ardour. My advice is that you pan all your hydrogen instruments to one side (i.e. left), and connect them to Ardour as mono tracks. Do all your panning in Ardour because this saves on processing power and RAM.

Other posts you might find interesting:
How to make a Hydrogen Drumkit
Pimp my Beats
Making a Roll Sound Realistic
My Attempt at a Hydrogen Drumkit
Hydrogen Drumkits