Setting dqH and dqV to zero shoud put 0 current on 30 quad trims
R2 should ignore the tune trombone equation when dqH and dqV are set to 0. The tune trombone equation has a non zero offset so when delta tunes are set to 0 there is still current on the quad trims. When the user desires 0 delta tune I should ignore the tune trombone and just set the quad trims to 0 amps. Meiqin believes both methods yield essentially the bare tune while ignoring the tune trombone would also give us a easy way to set all the qts to 0.