http://www7a.biglobe.ne.jp/~mpc1000/mpc ... ortant.htm1, About the relation between a PAD number and a sequence note number.
At AKAI OS, JJ-OS-Ver3.09, JJ-OS1, and JJ-OS2, the note number of a PAD number pair sequence is as follows by the default.

The program has this conversion table.
This conversion table can be rewritten by the user.
This is development of software with the big burden. The PAD pair sequence note number of XL is fixation.

It was produced by old OS. When a sequence is loaded to XL, the note number of a sequence is changed as follows.
In this case, MIDI OUT The note number carried out will also change.
In the case of TRACK TYPE = DRUM

If a PAD number is changed without changing a note number, PAD will come apart.
It becomes impossible to use a program. When the type of a track is MIDI, the note number of a sequence remains as it is.
Therefore, a note pair PAD number is as follows.
Although MIDI OUT is normal, the pronunciation of an internal sound source comes apart.
In the case of TRACK TYPE = MIDI.

If a note number is changed without changing a PAD number, a note will come apart.
It becomes impossible to use a sequence.
2. It is possible to load the sequence produced by XL and a program by AKAI OS, JJ-OS-Ver3.09, JJ-OS1, and JJ-OS2.
But there is an incompatible portion.
Example.
Main screen.
TYPE (DRUM, MIDI, AUDIO) is not displayed normally.
PROGRAM.
The value of AMP Velocty->Attack will change. (AKAI OS, JJ-OS-Ver3.09, OS1) .
SEQUENCE.
There is not compatibility of a note variation and Q-LINK real-time data.
3. Q- Link slider can be set only to an active track. (It cannot be set as a pad)
Q-Link slider will not work, if the AFTER key is not ON (the LED is lit).
Moreover, please turn OFF (the LED is turned off) the AFTER key, when the sequence on which note variation data is recorded is playback.
When the AFTER key is ON (the LED is lit), the note variation data currently recorded is not played back.
Q4 is used when a note variation is set as Q1, Q2, Q3, and Q4. (Q1, Q2, and Q3 does not work in this case)
Q3 is used when a note variation is set as Q1, Q2, and Q3. (Q1 and Q2 does not work in this case)
Q2 is used when a note variation is set as Q1 and Q2. (Q1 does not work in this case)
Example 1: When TUNE is set as Q1 and LPF is set as Q2, only LPF of Q2 works. TUNE of Q1 does not work.
Example 2: When TEMPO or MIDI CC is set as Q1 and LPF is set as Q2, both TEMPO or MIDI CC of Q1 and LPF of Q2 work.
Note variation = TUNE, LPF CUTOFF, BPF CUTOFF, HPF CUTOFF, LAYER, ATTACK, DECAY, S.START, S.END, CHOP, VELOCIT
In addition, behavior of CUTOFF was changed.
OLD OS is a value of value + Q-Link of a program.
XL does not use the value of a program.
Only the value of Q-Llink is used.