Yamaha SY85 Owner's Manual page 63

||: (Begin repeat)
This symbol indicates the beginning of a range of rhythm parts to be
repeated. The begin repeat event has no other parameter.
:|| (End repeat)
A "||:" must always be followed at some point by a ":||" symbol signify-
ing the end of the range of parts to be repeated. Use [CS4] to set the
number of times the specified section is to be repeated (x 0 ... x99).
vol (Volume change)
This event produces a volume change at the selected part. The [CS4]
slider sets the new volume level (0 ... 127).
tmp (Tempo change)
This event indicates a tempo change to occur over a specified number of
beats. The numbers above the [CS4] slider define the tempo change: the
number to the left of the slash (-99 ... 0 ... +99, or atmp for "a tempo")
sets the number of beats per minute by which the tempo will decrease or
increase, and the number to the right of the slash (0 ... 99) sets the
number of beats from the "tmp" mark over which the change will occur.
A setting of "+20/8", for example, would increase the tempo by 20 beats
per minute over 8 beats (2 measures of 4/4 time). The [F4] function key
is used to toggle the cursor between the left and right numbers, and
[CS4] is used to change the selected number.
mark (Search mark)
This sets one of 16 markers to be used by the rhythm track search
function described on page 63. [CS4] is used to specify the marker (A
... P).
The [F5] through [F8] function keys are used to access the rhythm track
edit functions described below:
5. The Sequencer
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