3.7.1. beep - play a GRUB beep tune

3.7.1.1. Usage

beep tempo [pitch1 duration1 [pitch2 duration2] ...]

3.7.1.2. Synopsis

Tempo is an unsigned 32bit number. It's followed by pairs of unsigned
16bit numbers for pitch and duration.
The tempo is the base for all note durations. 60 gives a 1-second base,
120 gives a half-second base, etc. Pitches are Hz.
Set pitch to 0 to produce a rest.
When only tempo is given, a beep of duration 1 at bell frequency results.

3.7.1.3. Options

-c

cancel pending beeps

-w

wait until beep is over