Checking the box next to "Reduce Amplitude" does not seem to reduce amplitude to the extent prior versions of the software did. Contact sessions using low frequencies have become uncomfortable.

The waveform and also the offset you use has much to do with the tingling sensation. Try to use a harmonic waveform, like InvSawtooth Harmonic, or Sine Harmonic. These waveforms greatly reduce the tingling sensation, allowing you to untick the reduce amplitude box (try this with caution).

For more details, please check the link:
http://www.spooky2.com/forums/viewtopic.php?f=39&t=5024