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Hello,
on http://demozoo.org/ I was looking for some gameboy / lsdj competitions but I can't find that many, probably old computers are more expected in those parties. Are you aware of some other announcement boards where we could find more chiptune related song competitions?
Probably won't be many at european parties as Gameboy isn't a big demoscene holdout. Have you looked on Battle of the Bits?
I know that Kfaraday had expressed some interest in running a GBCompo (like famicompo) if there was a way to get something like an .Nsf out of LSDJ.
Battle of the bits is the next best thing for now, but they usually only have GB categories in the major seasonal compos.
You're right, there are some gameboy comps on Battle of the Bits. I don't think it's possible to get .nsf from LSDJ (gameboy and nes use different chips and nsf targets 2a03)
Something LIKE an NSF, that is to say, a song file independent of any tracker that can be played on hardware.
noisechannel.org used to have gameboy compos. Maybe you could just enter your lsdj music into more general competitions. I've entered LSDj, Mario Pants (Mario Paint port), and Beepola (ZX Spectrum Beeper) into thasauce.net compos
the only LSDJ competition that matters is the one in ur heart
(you also win every time)
Something LIKE an NSF, that is to say, a song file independent of any tracker that can be played on hardware.
ah sorry, I didn't see the "like" part.
There is such a thing http://ocremix.org/info/GBS_Format_Specification but I think a .gb file which autoplay would be enough (deflemask does this, and it can also export to gbs)
For players of gbs:
http://www.zophar.net/utilities/gbs.html
I made a tune with deflemask and it replays well with gbsplay.
Some years ago was released a stripped down version of lsdj which could only replay music, but it wasn't updated so it's probably not safe to use.
On this thread it seems it would be possible to convert lsdj songs to the vgm format: http://chipmusic.org/forums/topic/14932 … gbs-files/
Thanks for the noisechannel and thasauce links. And also for the your "ur heart" tips 
As I see it, the problem with using GBS would be you'd need LSDJ's driver and the data playable from that driver. Is that possible? I know there's a replay cart but I don't think there's a compilable driver out there for it. (unless you can hack it out of the replay cart I guess)
The streaming format (VGM) is more viable because you don't need any help on the code side, it's just sound registers being updated per frame. You can use Nanoloop, p5, whatever. And there are enough public compression formats that 3-4 minutes is viable in 32k or so. (Exomizer does a good job for me)
Last time I looked at streaming Gameboy sound data the problem I found was there wasn't an emulator that would log the sound registers for me. (I ended up with a custom solution thanks to a friend of mine) But maybe that's changed.
On the other thread about vgm, Delek (author of deflemask) thinks it shouldn't be very difficult to convert from vgm to gbs.
With a lsdj .sav and lsdjplayer (here), you can play lsdj tunes.
a vgm player could be great but it still has to be written ;-)
The issue with lsdjplayer is that kits are not embedded in the .sav, they're rom side. Having to send in your kits and have a list of instructions for placement a mile long would suck.
Gbs would be the best I guess? I think the biggest issue is that in a competition you don't want to limit the tools to deflemask/paragon5, when the vast majority of people making gameboy music use lsdj. I remember lsdsng2gbs being a thing I looked into a while back, but it seemed a bit arcane.