Video by Casio Music Gear via YouTube
Source
The CT-S1 has 61 tones, 35 of these are directly selectable from the front panel and others from the keyboard but you can also customize the front panel using the Tone Memory function. Casio’s Mike Martin takes you through this and more including removing the "notification sound" when you use functions.
For more information on the Casiotone CT-S1 visit:
https://www.casiomusicgear.com/products/casiotone-series/ct-s1