Greetings palfriend! I hail from a music creation and competition website called http://battleofthebits.org/and I'm sure your new tool will make many of our members happy and result in quite a lot of new 2600 music!
I personally have been aching for a 2600 tracker for YEARS, and am very happy that this is now a reality. ^_^
Some questions and bug reports:
*Naming instruments crashes the program on my machine (Win7)
*Song playback does not work if patterns are not equal for each channel. Is this intended?
*Furthermore, the "goto" function does not work properly unless it is mirrored at the same place in the sequence on each channel. I would assume this is not intended if you have the ability to have them separate on each channel in the first place.
*Do you intend to add a .bin export for 2600 emulators?
That is all I have for now, but I'll be sure to get back to you if I find anything else. Anyways, great work!
*Edit// And here is a showcase of some 2600 tunes made for BotB:
http://battleofthebits.org/arena/Entry/Fire+of+Shibuya/12108/
http://battleofthebits.org/arena/Entry/The+Year+2014-A/11996/
http://battleofthebits.org/arena/Entry/Zombified+Zombie+Bones/1818/
http://battleofthebits.org/arena/Entry/Oil/12071/
http://battleofthebits.org/arena/Entry/Octahedric+Speedrave/16589/