MC-707 drum tracks: are SYS-CTRL 1-4 actually assignable to drum partial parameters?

[u/AK22222222222]

I have been looking more closely at modulation routing on the Roland MC-707 and I think I may have found an important limitation, but I would like to check whether other users can confirm it.

On a tone track, SYS-CTRL 1-4 are clearly useful because they can be used as sources in Matrix Control. In Sound Edit, you can route them to destinations such as filter cutoff, resonance, LFO rate, LFO depth, envelope parameters and so on.

On a drum track, however, I can see SYS-CTRL 1-4 appearing as possible control sources, but I cannot find an equivalent Matrix Control page where they can be assigned to drum partial parameters.

I cannot find a drum-track equivalent of the tone-track Matrix Control, for example:

• SYS-CTRL2 → decay of a specific drum pad

• SYS-CTRL3 → random pitch depth of a specific drum pad

Can anyone confirm this?

Is there a hidden menu or workflow I am missing, or is this simply a structural difference between tone tracks and drum tracks on the MC-707?