Yamaha MU90R Owner's Manual page 127

UTILITY MODE
Dump Interval (DumpIntrval)
Thru Port
Display Bank Select (DispBankSel)
This determines whether the MU90R displays all Voice banks or not
when changing banks. (For information on changing banks, see page
42.) When this is set to "1," the MU90R conveniently skips over banks
that have the same Voice. In other words, when you step through the
available banks, the display stops only on banks for which the Voice is
unique or different (for the selected program number). If "2" is se-
lected, all banks are displayed in succession, regardless of whether the
Voices are the same or not. The Display Bank Select setting itself can-
not be changed by incoming MIDI messages.
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This determines the length of time the MU90R pauses when send-
ing blocks of data in the Dump Out functions. If the receiving de-
vice fails to process the data or displays a "buffer full" type mes-
sage, try setting this parameter to a higher value and send the data
again.
Some MIDI devices and sequencers are capable of transmitting data
over several MIDI "ports," effectively breaking the 16-channel barrier.
When this data is received via the TO HOST terminal on the MU90R,
this parameter determines which MIDI port's data will be routed
through the MIDI OUT terminal. This allows you to connect another
multi-timbral tone generator to the MU90R and play back data over
48 independent MIDI channels — 32 on the MU90R and another 16
on the connected tone generator.