Yamaha TX81Z Product Manual page 40

Volume
Out Assign
LFO Select
The volume of each instrument can be set independently. A vertical bar beside
each number graphically indicates the volume.
Note
When an instrument receives a MIDI Control Change Bn.07.xx (volume),
this setting will be defeated, ie. MIDI will set the volume regardless of this
setting. If you want to set the volume of an instrument so that MIDI will
control the volume within a setting, set the operator output levels of the
carriers (p.20) in the voice data.
The output of each instrument can be assigned to either or both of the rear
panel outputs.
This selects the source of LFO modulation for each instrument.
When "off" is selected, the instrument will use neither Amplitude modulation
nor Pitch modulation.
When "vib" is selected, the instrument will use the LFO settings from its own
currently selected voice memory, but there will be no Amplitude modulation.
(Thus, if you need only Pitch modulation, each instrument can have its own
independent LFO.)
If an instrument is to use Amplitude modulation, it must share the LFO of
either the first or second instrument in the performance. The display will
indicate the instrument number (1-8) who's LFO will be used. If only one
instrument is active, "---" will be displayed instead of the second instrument
number.
In the display below, instrument 1 is inactive (its Max Notes setting is 0), so
instrument 2 is the "first" instrument. Set as shown, instrument 2 will use its
own LFO (with Amplitude modulation), instrument 3 will use its own LFO
(without Amplitude modulation), and instrument 4 will use the LFO of in-
strument 3 (with Amplitude modulation).
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PERFORMANCE: Edit