so right now im using corelli strings and a schaller magnetic pickup to play through my effects. the sound is ok but i found some strings that i prefer the feel of called innovation super silvers they feel great but since they're non-ferrous, i can't use the schaller pickup with them. which pickup would you recommend in this case and would i need some sort of preamp? i think someone recommended a full circle but to get the right one. how would i know which one is best for this? thanks!