-LsdjSync
LSDJ provide a sync feature, similar to sync24 (24ppqn, or pulses per quarter note),
http://en.wikipedia.org/wiki/DIN_Sync,
with the difference that the gameboy do not wait for pulses, but bytes (so 24 bytes per quarter notes)
So converting Sync 24? to Lsdj is quite simple :
Every Sync 24? pulses must be changed into bytes (0xff, or b11111111)


Check this gwEm page to learn how to generate bytes with a NE555 :
http://preromanbritain.com/gwem/lsdj_pitch/index.html
Thanks to gwEm and Johan for details.
Lsdj to sync24 demo video :
http://www.youtube.com/v/KOIxR6RWC_M
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bill