I use WACOM’s One by small.
When I select the frequency pencil and turn on pressure control, the volume does not increase even if I press the pen harder on the tablet.
Is it possible that my tablet doesn’t support pressure control?
Or does pressure control not change the volume?
My guess is that your pen tip (nor mine!) isn’t set up for pressure control to change the volume. While I don’t have a Wacom, I have a Huion touchscreen, I couldn’t come up with a pen setting or SL shortcut that would change the selection volume when using different pressures. It seems that in SpectraLayers, one would need a macro sequence to try to do this. You can select with your pen and then use the amplitude tool or Gain module to increase.
Try out some different things! I will as well, and if something appears, I will post it here!