Yes, a higher value means the hit frequency is more significant.
You can check how is threshold calculated from here:
And you can download Spooky2 full user guide from here:
Use the default scanning frequency range. If you load "GX General Biofeedback Scan (C) - JW" preset it will set the Start and Finish frequencies automatically.
Use the default Setting of Sine wave which is set automatically when you load "GX General Biofeedback Scan (C) - JW" preset. Other waveforms introduce harmonics which you don't want when running a biofeedback scan.
For more details, please check the link: