(bind-func static svf_mc_c
  (lambda (nchan:i64)
    (let ((svf_buf:[|6,float|*,float,float,float,|6,float|*]** (zalloc nchan))
          (i:i64 0))
      (dotimes (i nchan) (pset! svf_buf i (svf_c)))
      (lambda (chan in cutoff res outarray)
        ((pref svf_buf chan) in cutoff res outarray)))))