The TR-505 is a great little drum machine from the 1980's. It's the little brother of the 808 and is much less in demand, and as a result more available and less expensive. I was lucky enough to pick one up at Trading Musician in Seattle, and it came with the manual. Since manuals are more fragile than the hardware and tend to get lost or destroyed over time, I decided to make a scan of my manual for those who have the box but not the book.
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P.S. After I went to all the work, I found that Roland has put the manual online -- Roland's 505 manual