Another guy posted with different wording about MODO Bass 2 and I thought that I was using v1.5 but it turns out that I'm using MODO Bass 2 as well.
On the low E string, when using the finger playing style, if two quick notes are played in succession (meaning that there's not a long pause between the two notes, like two 8th notes happening quickly back-to-back), there will be a loud velocity burst on one of the proceeding notes. There's no way to control it because, with enough playback starts and stops, the note will play correctly....but most of the time, it will not. Therefore I can't get any consistency in the velocity that is actually being triggered in the program.
I'm surprised that no beta testers noticed this when they were testing the program. I noticed it within minutes and I've had the issue for months but I haven't gotten around to mentioning it until now.