Hey,
Someone posted this in a topic on the steam forums:
Quote
After much experimenting I found that each message-line must use a 'game_text' assigned to a 'channel number' ie; the first message-line is assigned to 'channel1' and the next message-line to 'channel2', etc. Since there are only 4 channels no more than 4 lines can be shown. Also the Y position (vertical lines) are separated by just 0.5 that is line 1 is at 0.1 and the next line should be 0.15
I hope that helps!