I have an older revision of the E-Licktronic Nava, v1.0L, which apparently has an issue with the bass drum. One of the traces on the board has to be cut and bypassed by a flying wire. This problem has been corrected in newer revisions of the board (I am not sure which revision though). See the build guide and the following post on the forum: http://www.e-licktronic.com/forum/viewtopic.php?f=24&t=889&start=50#p6085.
I haven’t been able to test this yet as I have to build the rest of it to hear the results. I’ve tried to follow the information on the forum.