Web DMX Develop Documentation Index
Here is a client UI usage guide.
The faders can be switch to show only 64 channels.

Key control is also available. Ctrl + 1…9 key, then select a tab ‘All’…‘449-‘.
The faders can control with mouse or cursor keys.
Mouse control:

Cursor key control:

You’d like to try it? UI demo is available.
You can write custom text above each faders.

Note: Labels won’t be synchronized with other devices. The view applies only own device.