Ah, actually, doing a bit more research it looks like Synth users are out of luck editing frqs. But if you manage to bypass the hell that is MacOS, frqeditor is a 3rd party program by nmasao (iirc?) that allows you to edit frqs. I'm not the best at explaining, but it's a very straight forward...
Checked the vb, and for 'a こG4' its an frq issue as seen below.
It's an easy fix, as well as a common problem in multi-pitch vbs( in my experience, since it's harder and more time-consuming to check every. single. sample. for minute problems like this )
But I can't see an obvious frq problem...
A friend of mine does midi commissions. His twitter is @orbtunes for examples (plus this cover I did), and his email to contact him about commissions is tenshifos@gmail.com. He does great work, and honestly doesn't charge much.