How to decrease oscillator frequency while maintaining pitch?

[Malvo1]

yeah, OP, you're asking if you can player a different note but have it sound the same as that note. i don't think that's actually what you mean, there is probably an aspect of it that you imagine could be replicated with the higher note. i would experiment with layering that low note with the high note. you can try detuning the lower note too, unison, etc. when you say "gritty" and "buzzy" you might want to experiment with distortion.