Accordion players distinguish between bellows attacks and finger attacks. In bellows attacks the button (or key) is pressed first and the bellows are moved after. In finger attacks, the bellows are set in motion (by pulling or squeezing them) and soon afterward the button is pressed down. In this work these two different and characteristic types of attacks are documented and compared, and the relationships between the control of the instrument, the generated sounds, and how these are perceived are analysed. Finally, a characterization of these two different types of attacks is given in terms of the duration of the attacks, the beginning and ending of the first harmonics and the evolution of some psychoacoustic parameters.