Yes, you would still have to select frequencies to run with the coil attached to the XM generator. Here are the Notes from the software for the Shell Preset for the coil:
"Spooky Coil converts the signals from the XM generator to a magnetic field. Any frequency or waveform can be used.
Connect Spooky Coil directly to the XM generator. For more power use the MN or High Power port of Spooky Boost."
Here is one Q & A on PEMF - although there may be more:
For more details, please check: