Hi There -
The LS can be a little tricky to set up because all the pots interact. Try this:
- put the SENS knob at 9:00 if you have humbuckers, a little higher with single coils
- turn the SWELL knob all the way clockwise
- make sure you guitar's volume knob is all the way up
- make sure the LS is first in your pedal chain
- start with the trim pot at center
- mute your strings, then play a single note and let it ring - you should hear a pretty good swell
- adjust the trim pot for longest swell, least volume cut. Shouldn't be too drastic a change, depending on taste
If you still can't dial it in, post some pics and we'll see if we can spot an error in the build.
Mike