A fluency aid 1 for users with a stammer, stutter or other speech impediment in logopedic therapy provides Altered Auditory Feedback (AAF, 10) based on the detected voice and automatically changes the type (eg. masked, delayed or frequency-altered) or a parameter (eg. delay or frequency) of the feedback after a random or predetermined time or the operation of a switch (20) . The AAF may be initiated or faded out upon Voice Activity Detection (30) or output at a volume dependent on that of the detected voice, and a metronomic pacing click (40) may accompany the feedback.
