Check the listing for details. Keith McMillen Instruments Softstep Model # K-700 & MIDI Expander K-701. Works. Condition: Used. Listed at 150.00 USD. The Keith McMillen Instruments Softstep Model # K-700 is a foot controller designed for musicians and producers looking for a versatile and intuitive MIDI control experience. With its USB interface, users can easily connect the device to their computer and seamlessly integrate it into their existing setup. The soft-step feature allows for precise and responsive input, making it ideal for live performances or studio recordings. Additionally, the MIDI expander K-701 provides extra capabilities for expanding the overall functionality of the system. Overall, the Keith McMillen Instruments Softstep Model # K-700 & MIDI Expander K-701 is a reliable and flexible tool for controlling and enhancing musical performances.