Thanks @samaaron. I had a look through the source code, and while it does quantise the input note to the nearest midi number, it doesn’t look like it’s inherently limited to whole numbers, since the ugen has a tune input that looks like it’s for the fractional part of the note (here).
When I get a bit of time I may try compiling a synthdef with the fractional part of the note wired up to the tune input and see if I can get it to play non-integer notes.
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