dieter, i've just received an a156 which needs calibrating. putting 1v
into it (from an a155) produces less than an octave. adjusting P4
downwards has the expected effect of reducing the interval between 0v
and 1v, but turning P4 clockwise seems to level out at a little under
11 semitones and won't reach the octave despite further (careful)
turning. any ideas

seems to be a good week for tuning problems :)

stu