A transmission system including an automatic transmission having a plurality of speed change modes, including at least a continuously variable speed change mode and a steeping speed change mode, and a sub-transmission connected to the automatic transmission. The method and system comprise requesting information about the capabilities of the accessory by the media player and providing information about the capabilities of the accessory by the accessory to the media player. , based on: 20-100 mol % of at least one cycloaliphatic diamine; and 0-80 mol % of at least one other aliphatic andor aromatic diamine; and also aromatic andor aliphatic dicarboxylic acids comprising at least 6 carbon atoms.