I used to use Octamed sound studio for sequencing and sample play back, its the most intuitaive tracker style programme there is which does this on the Amiga wich handle samples and sequencing.
Otherwise I am now using my old Amiga mods in Madtracker, converting them to fast tracker with Modplug. Music X did alot that I needed for basic midi stuff. By far one of the best music programmes which never got them coverage it deserved was musicline editor just because of chipstyle tunes on a GRAND scale. The Amiga was made for this stuff!
Happy sequencing!
J>>>