Using this bundle is a breeze. For the ERS 250 digital reverb, just plug it in and adjust the reverb level, decay time, and pre - delay to get the desired spacious sound. When using the ERS EchORek 2 tape delay, play around with the delay time and feedback to create cool echo effects. And for the ERS DimD chorus, set the rate and depth to add thickness to your sound. As for maintenance, keep these devices in a dry and clean place. Avoid exposing them to extreme temperatures or humidity. If they get dirty, use a soft, dry cloth to gently wipe them down. Also, make sure to use the correct power supply to prevent any damage.