Sysex delay requirements are based on Roland and Yamaha recommendations
for message types of either a "reset" condition or a 512 byte "worst"
case condition maximum length recommendation. Because the XP-50 and -80
use an internal sequencer resolution of 96 ticks (Parts Per Quarter
Note), milisecond delays will be converted to ticks for ease of
implementation, along with an initial "standardized" one measure setup
at 60 Beats Per Minute. Delay times are being recommended for two
reasons: (1) to allow adequate time for being sent, and (2) to allow
adequate sysnth processing time. Although the first is easy to
determine, the second varies with the synth in use.

Sequencer Resolution = 96 PPQN
1st Measure Setup Recommendations
Tempo = 60 BPM

128 byte packets should have 20ms delays which converts to
 20/1000 = x/96 :: x = 2 ticks [1.92] (according to Roland)

512 byte packets should have 120ms delays which converts to
 120/1000 = x/96 :: x = 12 ticks [11.52] (according to Yamaha)

Note, since packet sizes are fixed by Roland, some require more than
128 bytes and should be left intact. No packets require more than 512
bytes. Sysex "Data Set 1 [DT1]" "overhead" bytes required are:

F0 41 10 6A 12 a1 a2 a3 a4 ... cc F7 [requires 11 bytes setup]
where "a1..a4" represent address MSB thru LSB values.
"..." represent the actual data packet bytes,
and "cc" equals the checksum byte.

XP-50 Packets       Hex  Decimal  Packet Size + Overhead
=============       ===  =======  ======================
System Common       52   82       93
Scale Tune          0C   12       23
Performance Common  42   66       77
Performance Part    19   25       36
Patch Common        49   73       84
Patch Tone        0101  129       140 [fixed size - don't split!]
Rhythm Common       3A   58       69

For maximum GM/GS/XG compatibility, the folowing order of
sysex messages should be sent and allow a 50ms delay for
processing, i.e. 50/1000 = x/96 :: x = 5 ticks [4.8].

[asssumes Device ID = 10h]
GM System On  F0 7E 7F 09 01 F7
GS Reset      F0 41 10 42 12 40 00 7F 00 41 F7
XG System On  F0 43 10 4C 00 00 7E 00 F7

For maximum JV-1080 and XP-50/80 compatibility, the following
sysex messages in order are recommended if used/needed:

GM System Off               F0 7E 7F 09 02 F7
SYSTEM Bulk Dump
PATCH Bulk Dump(s)
RHYTHM Kit Bulk Dump(s)
PERFORMANCE Bulk Dump(s)
TEMP Performance Bulk Dump

At the end of each tracks performance data, the following
controllers are recommended being sent, or in lieu of a sysex
setup, send them at the beginning of the performance setup
measure.


Controller #   Name
============   ====
120            All Sound Off
123            All Notes Off
121            Reset All Controllers

Use data byte values of 0.

Note: Active Sensing (FEh) if enabled will do the same at
the end of a performance after a 300ms/400ms [Yamaha/Roland]
inactive MIDI data flow, however, the use of Active Sensing
unnecessarily "clogs" up the MIDI data stream, therefore the
above is recommended. Active Sensing is recommend to be
turned OFF (SYSTEM/MIDI/TRANSMIT MIDI|Active Sensing OFF).

In general a "one" data byte sysex message such as to Disable
the Performance Channel: F0 41 10 6A 12 00 00 00 1C 10 54 F7
will require 31250/10=3125 bytes per second that will take
12/3125 = x/1000 (still assuming 60 BPM) :: x = 384 ms ::
384/1000 = x/96 :: x = 37 ticks [36.864]. An overhead of 20ms
would be recommended of 2 ticks minimum to be added for a
total of 39 ticks.