the effects loop of filters is more so it’ll get your initial dynamics, innit? So things that mess with your dynamics – distortions, compressors, limiters, bitcrushers. Delays if you want it to get weird in the sense that the filter will probably be closed while the delay is still doin’ its thing.
i play a custom made Tele (made myself) its styled after the mid 70’s custom deluxe models but with active Seymour Duncan Blackout humbuckers and its own twisted look. i nick name it the “Terror-Castor”, and i also at times play my vintage Ibanez Iceman 4 string bass thru the same pedal board. (i made sure it works well with both, see my signature) the 4 string is strung standard, and i use Ernie Ball Beefy Slinky 11-15-22p-30-42-54 custom gauge 2627 on my guitar.
As Cryabetes mentioned, the STM’s effects loop is more of a utility feature rather than sound expanding (like the DXMB or DMMTT). The STM’s effects loop allows you to place an effect X in your chain before the STM’s filter, while allowing the STM’s envelope trigger to listen to the input signal before effect X. This is helpful for dynamic squashing pedals like distortion (and the other goodies mentioned by Cryabetes). Put a distortion in the loop (try the Fullbore) and you’ll hear the sweeping filter more prominently affecting all the distortion harmonics without compromising the dynamic character of your playing.
