How to avoid empty frames in the beginning of a recording?

[kflak]

Following the README I have written these functions to record and stop recording from the main output:

(defparameter *disk-writer* ())
(defparameter *rec-buffer* ())

(defun start-recording (path &optional (num-channels 2))
  (defsynth disk-writer ((out-buf-num 99))
    (disk-out.ar out-buf-num (in.ar 0 num-channels)))
  (setf *rec-buffer* (buffer-alloc (expt 2 18) :chanls num-channels))
  (setf *disk-writer* (synth 'disk-writer))
  (ctrl *disk-writer* :out-buf-num (bufnum *rec-buffer*))
  (buffer-write *rec-buffer* path :leave-open-p t))

(defun stop-recording ()
  (free *disk-writer*)
  (buffer-close *rec-buffer*)
  (buffer-free *rec-buffer*))

This works as expected, except that I get (expt 2 18) frames of silence before the actual recording begins. Is there a way to make the disk-writing start from the beginning, or would there be a way to automatically chop off the silence in the beginning? Luckily it seems to be a predictable amount, so should be able to solve this programmatically, possibly even using an external utility like sox... Of course, I'd prefer to get it right without tampering with the files afterwards.

[defaultxr]

Perhaps related to supercollider/supercollider#77 ?

[byulparan]

If identical sclang code exhibits the same symptoms, it's likely a SuperCollider issue and cannot be resolved here. If time allows, I will quickly test it in sclang.