this will look for a file in /samples for 909kick.raw on your sdcard
note: best to use raw, rather than wav, to avoid the wav header.
use something like audacity, so export wavs as raw files.
alternative is to assign a dial to pos, and then 'dial' past the click, but its easer to convert.
audacity, raw export:
must be a mono track
file -> export audio
format = other uncompressed ,
options -> header = RAW (header-less) , encoding = signed 16 bit PCM, ok