Lindsay,
Bit difficult without the model number (Margherita 2000 is the “family name”).
If you mean that the machine has three control knobs, you will have programme, spin or temperature control and dryer. Temp will show 30 round to 90; the other will indicate spin speed up to the machines maximum speed.
Hope this is of some use, if not let us know the model number (usually corner of control panel) and we’ll try to do it more scientifically.
Regards,
Penguin45.