R7
14
It’s not about the fundamental of a note that has the potential to exceed nyquist. It is any potential harmonic content. A saw or square wave has very high harmonics if not bandlimited that can and do cross nyquist often when using a sample rate of 44.1khz. This would be even more apparent with especially complex waveforms produced with wavetables, additive, FM, AM, RM.
If you skip about halfway in you can clearly see the aliasing in almost all modern day digital synths. The only solutions are to oversample (internally running at higher sample rates) run completely at 88.1 or 96khz or band limit everything so it doesn’t cross nyquist (sacrificing high frequency content.