is there a way to activate polyphony? im afraid i didnt find the button :P other than that, this is an amazing tracker! very, very good. Damn...
from what i know the only polyphony you can achieve is by using a separate channel. so if you had a 12 channel track (default) you can use 3-4 for a chord voice. The more common approach and more efficient would be to use the 0 (arp) command and create the illusion of a chord like most low poly count hardware chips did to sound bigger.
The command list is in the documentation