After storing the custom sound OLD ORGAN and custom rhythm 8BT SLOW ROCK to panel memory you can save the panel memory to SD but don't forget to also save SOUND MEMORY and ALL CUSTOM STYLE (page 2/3 of save menu). This is necessary to make sure that these custom files are available at reload.
Loading ALL CUSTOM STYLE will take more time at reload so you better copy the custom style to composer memory (custom style copy) and then save to panel memory together with the custom sound. In that case you should not forget to save panel memory together with composer and sound memory (page 2/3 of save menu).
I hope that you understand my explanation.
Bert