A signal vector is received over a plurality of channels. The invention also relates to a method for producing this material, comprising the following steps: producing a hot molten mixture consisting of sand and polymers; introducing said molten mixture into a mould; cooling the molten mixture under pressure until the molten mixture hardens in the mould. Some embodiments employ the common-mode signals to transmit backchannel signals for adjusting the characteristics of the differential transmitter. Based on the stored data, a decline in the amount of power supplied to the mixer is identified and the mixer mixes the dough ingredients for a predetermined period of time after the decline is identified. A predetermined amount of credit is transferred from the account to an EGM responsive to a command entered by the player at the EGM. While the piston descends just after the combustion in the cylinder, the intake valve is opened by the variable valve system for the intake valve such that the intake air is supplied into the cylinder from the engine intake system.