function [x, fs] = load_wav(path)
% Read a mono float32 WAV as written by audio-spike-sorting: a fixed
% 44-byte header (sample rate at byte 24) followed by IEEE float samples.
% numbl has no audioread; in real MATLAB, audioread(path) works too.
fid = fopen(path, 'r');
if fid < 0
  error('cannot open %s', path);
end
fseek(fid, 24, 'bof');
fs = fread(fid, 1, 'uint32');
fseek(fid, 44, 'bof');
x = fread(fid, Inf, 'single');
fclose(fid);
end