(REQ 128XL)CC-Control over Tracklevels with one Midichannel

it would be great to have the same feature like on Padlevel-Control where we can control the first 16 Levels with free choosen CC-numbers and on one Midichannel (like in the Midibutton-menu)

yup it's there
http://www7a.biglobe.ne.jp/~mpc1000/128xl/cc-mixer.htm

when i open your link,there are just a few japanese signs. the only possibility i know is the multimidichannelthing where midichannel 1 to 16 is routed to track 1 to 16 with a fixed cc-number 7 for controlling the tracklevel

Google translate reveals that there's maintenance going on:

It is the maintenance of service page now.

[Maintenance]
2014/01/29 AM 0:30 ~ AM 10:00

Sorry to trouble you, but to have you access it at a time, thank you.

Check back a bit later and also then make sure you've got the latest version.

EDIT: and yes this is different than what you mentioned above.