A pitch adjustment device for selectively adjusting the pitch of multiple strings of a stringed musical instrument from the open pitch while playing using a single lever, wherein the tension and pitch of different strings can be adjusted by different and adjustable amounts for each adjustable string. The invention also relates to a method for the manufacture of the copper alloy and to the use of the copper alloy. A locking member is movably attached to the reclinable seatback support and removably engages one of the plurality of detents. In the composition of the present invention the hydrophobic active agents may be vegetable oils, free fatty acids or vitamins, or any combination thereof and the hydrophilic active agent may be humectants, \u03b1-hydroxy acids, anti irritant agents, plant extracts, moisturizing agents or hydrolyzed plant proteins or any combination thereof. 5 to 20, for example 1 to 15 and preferably 2 to 12, to produce esters, for example methyl esters, for use as fuels.