So, you too you sequence songs by hand? Can I have a copy of your Lemmings&Cie songs please?
I thought you converted them, but I realise that it's not. Sorry!
I did convert the ONML ones, although even there, I still needed to do the following to produce something of Ahribar's satisfaction:
1) fix incorrect conversions (sometimes the notes' pitches are an octave too high or too low). Also I need to explicitly pick out which tracks are percussion.
2) pick a good combination of instruments (especially made challenging since general MIDI lacks good control of sound timbre)
3) balance the volume amongst the parts
4) possibly add an ending so that it loops well in Cheapo
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For the special graphics level ones, I hand-made BeastI (it's very easy to do), and convert the BeastII one from SNES version. For Awesome, I like the Amiga version the best, but there's no good way to do an automatic conversion for that one, so I decided to hand-sequence it--as a result I haven't finished with it yet.