Hi first of all im new to the site and fairly new to bass playing in general, i was a gui**** for 10 years but the band needed a bass player so i picked up and didnt struggle tremendously with anything they were playing. i bought the acoustic b200h head and the b115 amp, i like it the price was right and it has enough balls for smaller shows. however i seem to have the eq set the way i like it but theres a few knobs ive never encountered with any of my guitar amps. the first is an up/down switch in the back labeled "Ground Lift" and the second is a dial in the third spot over labeled "Frequency" ive taken it to both extremes and it doesnt seem to have a part in the tone. id appreciate anyone that could help without calling me a dufus/noob. ive literally learned 26 songs in 3 weeks im not terrible just technologically challenged.