Rachel, many times this is caused by different sound sources having different note ranges. For example if the note(s) are at the lower end of the spectrum and your sound source doesn’t go that low then you will not hear the note. Raising the bass line one octave should solve this problem

Another cause could be if your softsynth doesn’t have enough polyphony. That is it is set to play a maximum of 10 notes when your sequencer sends 11 notes then one will be dropped. So with the bass line if the polyphony is set to 1 and one note overlaps another the softsynth is receiving two notes, thus one will be dropped. Increasing the softsynths polyphony corrects this problem.

I hope this helps and good luck.


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