Features: LM-4 mainframe unit set with 4 guitar effect pedals (overdrive + Distortion + analog chorus + analog delay), powerful function and flexible usage. Supports storing 3 preset combinations, and each switch (A-C) is capable of activating stored effect, easy access to preset sound and tone effects. With true bypass designed, you can select one or more of the effect modules to be programmed into the ready preset switch by pressing buttons(1-4) and create the effect combinations you want freely. Effect pedals can be easily installed and removed with the special spring locking design without using any tools, and metal touch points design greatly reduces the noise from pedal linked cables and maintains the line signal intensity. The mainframe unit is made of aluminum alloy, CNC processing, durable and lightweight, maintains the traditional effect pedals styling and greatly increases the portability at the same time. How to store effects into preset switch (A-C) 1. Power up the platform System. 2. Press any preset switch (A to C), indicator will light up and will be in ready mode to program any effect to be stored into this activated preset switch. 3. Select one or more of the effect modules to be programed into the ready preset switch by pressing buttons(1-4). 4. Preset switch indicator will blink indicating that effects is assigned to this preset switch. 5. To complete programming , hold down preset switch until indicator stops blinking. This indicates that an effect is already assigned to this preset switch.