There’s this little gem of a tool which does generate multiple (and optionally, bandlimited) waveforms across octaves:
https://forum.renoise.com/t/new-tool-3-0-selection-shaper/41240
If you have a singlecycle (and only one), turning on the built-in oversampling/bandlimiting in Renoise does wonders too.
You can find it in the Sample Properties panel.
Also, when a single-cycles is supposed to play across the entire kb range, it’s good to have it generated at a low frequency.
Then, there are simply more “data” to work on as the pitch gets higher.