Natural gas is produced from a reservoir above a bitumen reserve with minimal or no impact on concurrent or subsequent production of bitumen recovery techniques including SAGD. In one embodiment, rapid, accurate, and repeatable tuning is obtained by a two-step process of adjusting the tension of the string to a stored value which may be then be corrected according to the pitch of the string obtained at later various times during the performance. As a result, it is possible to achieve a high-speed MOS transistor apparatus using an ultra-thin oxide film having a film thickness of 1. The spacing between the platforms can be adjusted to adapt for different landing gear configurations.