As a builder of a scratch built Wurlitzer 125 band organ, I know first
hand the need to offset the bass drum and snare drum holes from the
notes.  I built my tracker bar from Rock Maple wood, drilling round holes.
It works perfectly for 7 years now.

Originally I built the tracker bar with all holes level, but no matter
what roll I played the snare and bass drum would play 1/2 second later.
I assumed distance and/or "lag time" was the cause of the 1/2 second
delay.  Putting the snare pneumatic within 6" of the tracker bar still
indicated a 1/2 second delay, confirming my thought that the music is
definitely punched with a delay in the bass and snare notes.

Well, back I went to the drill press and a new piece of maple.  I offset
the holes upward 1/16 of an inch and it works perfectly.  Every roll
I own taps a perfect beat with the music.

Dave Repanshek
Portsmouth, VA