I was needing the instruction manual for a BOSS DR 550 MK II Drum Machine
The DR-550 MkII is the upgraded version of the venerable,
original DR-550. ... Also, as in other drum machines in the
DR-series, you can chain patterns to forms songs - In the DR-550 MkII, up to 8
songs ... Boss DR-550 Mk II manual. Available ...
www.synthmania.com/dr-550mkii.htm
Just checked this site. I am sure this manual is the one you want
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