Conventionally, an electronic musical user input, such as an electronic keyboard has pre-programmed pitches associated with each key. These pre-programmed pitches correspond to the pitches from their acoustic counterparts. While some methods do exist of remapping the keys in such a way that a user cannot make a so called ‘bad’ sound by playing a wrong 5 not, there is little freedom in the selection of the ‘good’ notes. Therefore, there is herein provided a method of adjusting the complexity of a chord which therein determines the actual set of pitches which can be assigned to a user input device in order to increase the flexibility of remapping systems.