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let me explain the "Hook" and "Latch" options as follows:
- it is quite normal to the state of a MIDI control value to be out-of-sync to the software control or subject to which it is mapped;
- qtractor also features this so called catch-up behavior by default which means that the control values will only sync when the MIDI control and the subject value do match each other state and value;
- the "Hook" option disables the normal catch-up behavior, so that any MIDI controller value will set the target subject's state and value immediately;
- the "Latch" option is specific to toggling subjects and when turned off, which is then said to be a momentary control, will trigger an unconditional toggle of the target subject whenever its MIDI control value changes in full-swing or toggles in either direction, from on to off or vice-versa.

hth.
cheers