Only single beep for a series of bells in PuTTY

Question

After typing echo -ne '\a' && echo -ne '\a' in PuTTY session only single beep is being produced on local computer instead of two beeps.
What is the reason?

In PuTTY settings for this session, Beep using the PC speaker radio is checked and Bell is temporarily disabled when over-used checkbox is unchecked.

score 2 · Accepted Answer · answered Sep 06 '23 at 12:17

See PuTTY's source code for answer. In case of "PC speaker", it beeps only if at least 50ms elapsed from last beep. https://github.com/github/putty/blob/master/windows/window.c#L5566

if (mode == BELL_PCSPEAKER) {
    ...
    beepdiff = GetTickCount() - lastbeep;
    if (beepdiff >= 0 && beepdiff < 50)
        return;

Only single beep for a series of bells in PuTTY

1 Answers1