1. the base at the beginning sounds very very identical, i create this file based on the XP wavetable, i can make a wave-file of the midi, then you can hear it !
2. make sure that you FIRST switch to the XP wavetable, and then start the MIDI file, in the first blocks of the midifile are the instrument and enviroment settings like witch instrument using for cannel 4 (i.e.), cutoff filters, resonance filters etc..
if you start the midifile not at the beginning, you will have only wrong instrument allocation , like pianos and trumpets ;-P !!!!!
EDIT: Ok strobe you are right....damn now i know what you mean with the baseline ...rofl sounds very crank, i have tested it on a other PC :-(( damn !