playTone(frequency, duration, pause [, flags [, freqIncr]])
Play a tone
@status current Introduced in 2.1.0
frequency(number) tone frequency in Hz (from 150 to 15000)
duration(number) length of the tone in milliseconds
pause(number) length of the silence after the tone in milliseconds
0 or not presentplay with normal priority.
PLAY_BACKGROUNDplay in background (built in vario function uses this context)
freqIncr(number) positive number increases the tone pitch (frequency with time), negative number decreases it. The frequency changes every 10 milliseconds, the change is
freqIncr * 10Hz. The valid range is from -127 to 127.