MP3Hombre,
My thoughts - generically speaking, if you are using nylon strings on your instrument, an inductive (magnetic) pickup will not produce any output as it converts the mechanical energy into electrical energy by (ferrous type) metal strings cutting the magnetic lines of force produced by the pickup. A piezo style pickup however converts the mechanical energy of the strings (metal or nylon) including the instrument body into electrical energy by the crystal element itself being bent, squeezed or twisted by the instrument itself.
Bottom line - If you want more of an electric guitar sound from your acoustic guitar, use metal strings and a magnetic pickup. If you want to capture more of the "acoustic" sound, use nylon (or metal) strings and a piezo pickup. I would be glad to assist you in finding a diagram of either or both types if needed.
Many Cheers!
ElecTr?