The slim profile of the SP-100 may save your back as well as space. The buttons control effects, select sounds, start and stop the metronome, and control the MIDI recorder.
Additional parameters are generally a function button and several key presses away.
Three key response settings. Tinny loops in piano samples. User settings lost when keyboard is shut off. No LCD or LED display. The SP-100 has a very playable action, and its sounds are fine for student practice, piano labs, and church choir rehearsal situations.