There's a bug in supercollider sample at musikinformatik/SuperDirt/blob/develop/hacks/pitch-model-from-tidal.scd . The line if(~n != 0) { ~note = ~n }; // interpret n as note (might be also degree) should be n ? { ~note = ~n }; // interpret n as note (might be also degree) as n is nil and not 0 if you're not using n in Tidal.