Send Control Changes directly (!) to the Softstep port.
A complete LED message consists of three CC messages:
CC 40 tells is the pad number starting from 0.
CC 41 tells is the led color.
CC 42 tells the led state.
Examples:
40 0 —> pad 1
41 0 —> green
42 1 —> on
or
40 0 —> pad 1
41 1 —> red
42 0 —> off
or
40 0 —> pad 1
41 2 —> yellow (= red and green)
42 1 —> on
or
40 5 —> pad 4
41 2 —> yellow
42 2 —> blink slow
Always in the order CC 40, 41, 42 and don't send anything between. The yellow LED is red and green. If you don't know the current colour or state of a LED, first turn it completely off and then set it to what you need.
Check Chris Lavenders LED patch:
http://christopherlavender.com/wp-conte ... _cntrl.zip
The MIDI output will tell you what you have to send for pads, colours and states:
I took the link from this thread:
An example using Softstep with only standard Max objects
Which may generally be of interest for you.