playTone(frequency, duration, pause [, flags [, freqIncr]])
Play a tone
@status current Introduced in 2.1.0
frequency(number) tone frequency in Hz
duration(number) length of the tone in (TODO units)
pause(number) length of the pause in (TODO units)
0 or not presentplay with normal priority.
PLAY_BACKGROUNDplay in background (built in vario function used this context)
freqIncr(number) positive number increases the tone pitch (frequency with time), negative number decreases it. Bigger number has more effect
Minimum played frequency is 150Hz even if a lower value is specified.