The process of getting the file to work was difficult. First, convert the file to MIDI format using SynthFont. Then, use strings for almost everything since there isn't a horn instrument that goes up to a E7. Then, add the markers since they do not get imported. Finally, fix the zero-length notes by selecting all and clicking on the resize button.
Link to this sequence: 3176432
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Bitcrusher
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Resonance (Q)
LFO
1/4
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(test) In the Hall of the Mountain King.RMI (fixed).mid by SubtotalAnt8185