The tone frequency in hz of the systembeep.
systembeep.name.frequency
Read/Write
integer
The frequence must be an integer between 37 through 32,767. By default, the frequency is 750 hz.
The following trial presents a beep at 2000 hz.
<trial beeptrial>
/ onTrialBegin = {systembeep.frequency = 2000}
/ stimulusTimes = [1=systembeep]
/ validResponse = (anyResponse)
</trial>