Here is what he says:
1. Get a VST instrument you like and get a patch you like on it. Synth, drum synth, piano, whatever. Or any sample instrument you already have and like. It can be any instrument at all.
2. Use Renoise's plugin grabber to convert it into a xrns instrument and save the song.
3. Use this http://www.renoise.com/tools/xrns2xmod
and/or this http://xrns2xmod.codeplex.com/ to convert the song into an xm or mod file.
And as it is possible to import xm and mod files directly into SunVox thats it...
Carbonthief is a new user of SunVox but have already started to compose in it and here is a Work in progress that we can listen to while we experience time passing by.