Thanks for this post.
I have done everything, including adjusting the trim, nevertheless my brand new doctor Q
has that persistent problem.

The range button does not change anything, like if it was’nt working.
The trim is working though, changing the output level, the swish and so on.
Same for the switch.

There is no effect at all, except some tone variation and things said upthere.

Could it be possible technically that my range button is broken, stuck to 0 ?
If not, i’ll get back to lego© I guess…

Thanks for help.