Difference between TRIM's "loop on" & AMP's "loop and hold"

MPC 1000, JJOS2XL.

"loop on" is in the TRIM window.
"loop and hold" is in the AMP section of the PROGRAM window.

These 2 settings should logically do different things, or address different issues. Unfortunately the JJOS2XL manual does not really explain this.

Anybody can explain what is their difference ?

Thanks !

LOOP ON
In the trim mode you can specify loop points and loop direction for an audio sample. When a sample has loop points, and you use a NOTE ON trigger type in the program, if you hold down the pad longer than the end time it will go to the loop start position and begin playing with the direction set, either just forward, or forward then reverse, continuously bouncing between loop points until pad is released.

LOOP&HOLD
With a trigger type of LOOP&HOLD, even if loop points are not set, pressing a pad will turn LOOP ON for the sample, trigger using NOTE ON, and act as if you were holding the pad indefinitely. It will play continuously, using the settings of LOOP ON, even when it appears to be disabled in TRIM mode. When you press the pad again, it acts as if you released the pad when using NOTE ON trigger mode.

LOOP ON & NOTE ON when you want it to loop using the TRIM loop settings while holding the pad down, stopping when the pad is released.
LOOP & HOLD when you want it to loop using the TRIM loop settings even if LOOP is OFF so you can't see them, not stopping when pad is released.

Jamon wrote:LOOP ON
In the trim mode you can specify loop points and loop direction for an audio sample. When a sample has loop points, and you use a NOTE ON trigger type in the program, if you hold down the pad longer than the end time it will go to the loop start position and begin playing with the direction set, either just forward, or forward then reverse, continuously bouncing between loop points until pad is released.

LOOP&HOLD
With a trigger type of LOOP&HOLD, even if loop points are not set, pressing a pad will turn LOOP ON for the sample, trigger using NOTE ON, and act as if you were holding the pad indefinitely. It will play continuously, using the settings of LOOP ON, even when it appears to be disabled in TRIM mode. When you press the pad again, it acts as if you released the pad when using NOTE ON trigger mode.

LOOP ON & NOTE ON when you want it to loop using the TRIM loop settings while holding the pad down, stopping when the pad is released.
LOOP & HOLD when you want it to loop using the TRIM loop settings even if LOOP is OFF so you can't see them, not stopping when pad is released.

Thanks !