If you are using RealDrums, it can be narrowed down to the bass line. I have found a few styles, COC~TAIL and JAZSIMP to name a few, that has a periodic bass note way out of range. It sounds like a random piano or guitar note way up in the register. I don't know why this is present but it is. Perhaps it is how the synth handles the note. Both VSC/DXi and Forte have exhibited this. I don't know if it would occur using an external synth.

Next time it occurs, tell us a bit more about the song. What chord is it occurring on? Chord sequence surrounding the problem? Part marker color in which it occurs? Tempo? Key? This is for our knowledge base. If it is a glitch, it would help if you would freeze the bass track and send the file to support@pgmusic.com indicating which measure number the note occurs. Hopefully they can fix the problem.

If you want to use COC~TAIL in a lot of songs and the problem continues, there is a simple way you can edit the offending pattern in the style. Of course, it needs to be identified first.

R