AKWF-FREE VS PicoADK-Firmware-Template

A technical reason is that 440Hz (or its multiples) plays nice(st) with common recording frequencies such as 22.05kHz, 44.1kHz, 48kHz, 96kHz, etc. Taking 44.1kHz for example, if you divide 44100 samples per second by 100 cycles per second, you get a clean 441. Meaning that if you would concatenate 100 single-cycle waveforms you would end up with a perfect 441Hz pitch, which is only an 1Hz error (barely audible if put side-by-side). Being able to work in integers like that is extremely beneficial for "lighter" variants of DSP algorithms (such as resampling algorithms) - it may help reduce aliasing as well as manual sample editing or synthesis (one of the reasons why the AKWF single cycle collection were originally created at a multiple of 100 samples as well).

I haven't tried making wavetables from scratch, but if you haven't already you should check out the Adventure Kid waveform pack. He created them from a whole variety of sources - traditional instruments, synths, nature sounds, etc. - and they're public domain.

3xOsc is such a great utility synth, I use it for bass and leads a lot, sometimes all you want is just a sine wave or a de-tuned saw with basic envelope. The custom waveform support makes it super versatile. While fruity does come with some custom shapes I'd recommend getting a waveform library to expand your options - (this one is decent and free: https://www.adventurekid.se/akrt/waveforms/adventure-kid-waveforms/). I normally do all my filtering/distortion/reverb etc downstream of it so it works well for my work flow.

Adventure Kid has a bunch of single-cycle waveforms for download here.

Adventure Kid

I think that this is the paradise of waves! https://www.adventurekid.se/akrt/waveforms/adventure-kid-waveforms/