I've created a fat XM module with aim to finding bugs in XM Replayers, narrated by some cute voicesynthesis and elevator music, this will guide you into the unknown universe of the XM fileformat! =)
And yes, it replays flawlessly in FT2, which was the aim.
Rev 15 update: Higher precision Instrument Vibrato test.
Rev 14 update: added exception check for trackers/players that
interprets jumpvalues as Hex instead of Decimal.
All other trackers, including MilkyTracker fails on atleast some points.