ticking sound sputters

[MooersLab]

The timer sound sputters randomly duing a pomodoro.
The randomness is distracting.
Below is my configuration.

(use-package org-pomodoro
    :ensure t
    :commands (org-pomodoro)
    :config
    (setq alert-user-configuration (quote ((((:category . "org-pomodoro")) libnotify nil)))))

(require 'sound-wav)
(setq org-pomodoro-ticking-sound-p 1)
; (setq org-pomodoro-ticking-sound-states '(:pomodoro :short-break :long-break))
(setq org-pomodoro-ticking-sound-states '(:pomodoro))
(setq org-pomodoro-ticking-frequency 1)
(setq org-pomodoro-audio-player "mplayer")
(setq org-pomodoro-finished-sound-args "-volume 0.9")
(setq org-pomodoro-long-break-sound-args "-volume 0.9")
(setq org-pomodoro-short-break-sound-args "-volume 0.9")
(setq org-pomodoro-ticking-sound-args "-volume 0.3")

(global-set-key (kbd "C-c o") 'org-pomodoro)

[hwiorn]

Check #106. I think this PR can help you.