Keysounds in SM files

I have decided on trying to make a keysounded simfile, purely out of curiosity. I have already started re-composing the main fight theme from River City Ransom in FruityLoops, with the Magical8Bit Plugin. The first 15 seconds so far are done, and it sounds nearly-perfect.

Anyway, I can't find the options for adding keysounds to notes in the StepMania CVS editor, and I haven't found any tutorials online how to keysound a StepMania file, after over an hour of searching. I know it's possible, because of a YT video I saw, where someone played some GhostBusters song on StepMania CVS, and it was keysounded. The .sm file also has a #KEYSOUNDS section at the end of the header, too, but I don't know the format for setting up the keysounds.

So, help, anyone?

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What StepMania version was it? Perhaps it was modified.

Link to video and .sm, perhaps? I'd like to browse through it too.

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Edit: So noone knows the format for keysounds in SM4?

Could someone maybe point me in the direction of someone who might know? Should I even bother asking at BMS? (they are somewhat elitist/sarcastic there, so I'd wait for a second opinion)

I finished the 8-bit bass music for the simfile, and I finished all 71 keysounds it will use.

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StepMania CVS supports keysounds, according to some long-ago posts by BemaniStyle users.

The keysounded simfile I saw was here: http://www.youtube.com/watch?v=qnn2uInOHcY

I took a random simfile, Bloodrush, and stuck it in SM4 to save it in the editor. I didn't make any changes or whatnot, just opened and saved. Here's what the header in the simfile looked like, minus the data included for bgchanges:

#TITLE:Bloodrush;
#SUBTITLE:;
#ARTIST:Tekno Dred;
#TITLETRANSLIT:;
#SUBTITLETRANSLIT:;
#ARTISTTRANSLIT:;
#GENRE:Trance;
#CREDIT:;
#BANNER:Bloodrush-banner.png;
#BACKGROUND:Bloodrush-bg.png;
#LYRICSPATH:;
#CDTITLE:;
#MUSIC:music.ogg;
#OFFSET:0.001;
#SAMPLESTART:54.680;
#SAMPLELENGTH:11.920;
#SELECTABLE:YES;
#BPMS:0.000=158.000,77.000=79.000,109.000=158.000;
#STOPS:12.000=1.139;
#TIMESIGNATURES:0.000=4=4;
#BGCHANGES:;
#BGCHANGES2:;
#KEYSOUNDS:;

The #KEYSOUNDS area is blank by default.

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Ask on StepMania.com forums? I've never gone there but they'd be the ones to know.

Sorry, I don't have a lot of time (finals!) to toy around with it at this time, and it's not inherently obvious to me how it works.

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