Using the Ampeg SGT - DI preamp/DI 3 - Band EQ Stompbox is easy. First, connect your bass to the input. You can use the 3 - band EQ to adjust the sound. The sweepable Mid circuit allows you to fine - tune the mid - range frequencies. Switch between the SVT and B15 voices using the SGT circuit switch to get different classic Ampeg tones. The Ultra - Hi and 3 - way Ultra - Lo switches can add extra brightness or low - end punch. If you want to control the dynamics, use the variable compressor. The Aux / Headphone section is great for practicing quietly or adding external audio sources. For the IR Loader/Cab Simulator, use the free Ampeg IR Loader app to choose from factory cabs or add your own. When using the app, make sure your device is properly connected and updated. As for maintenance, keep the stompbox clean and dry. Avoid exposing it to extreme temperatures or moisture. If there are any issues, check the connections first. If problems persist, contact Ampeg support.