Articles, particularly pressure pipes, having high strength as well as high stiffness and very good impact resistance even at low temperatures can be obtained by using a heterophasic polyolefin composition comprising 70-90% of a random copolymer of propylene with 0. More particularly, the invention pertains to a computing device that is capable of controlling the speed of the music so as to affect the mood and behavior of the user during an activity such as exercise. The method further includes forming heat current supply lines connected to each heat current supply via and forming at least one read line above the at least one tunnel junction and physically connected to the at least one tunnel junction. The load devices are coupled to the connection ports, respectively.