By which I mean songs that alternate F speeds on every row of the song to keep a consistent # engine frames per row.
So the idea is: on the FTM's Speed box, the user is allowed to specify a fractional digit and FamiTracker will implement it as an alternating sequence. E.g. if a song's Speed box says "5.5" then FamiTracker will regard it as alternativne F06/F05 speed (for a tempo of ~163).
Alternatively, the user could specify an actual F sequence for their song's default Speed (e.g. "6,5" for F06/F05) and FT could apply it accordingly during playback.
