Sodemo engine was further tuned to . The stock engine was tuned to produce . However, when playing with harmonic instruments, they may be tuned to specific notes. SAAB also tuned the engine to . Hearing aids can be tuned to specific frequency losses. The longer scale instrument can alternately and safely be tuned to GDAE. Transformer coupled amplifiers are often also tuned amplifiers. See pitched percussion instrument for discussion of the differences between tuned and untuned percussion. Bass is tuned low as well, and is often distorted. With this the Pejsa model can easily be tuned. Mutes are used to silence strings that are not being tuned. However, they can also be tuned sharp or flat prior to performance. Heat pipes must be tuned to particular cooling conditions. For 2016 season, the engine was tuned for . By making one of the lasers tunable, the VUV can be tuned.