a982a7cc67
smallstep (resp. largestep) is intended to be the interface delta corresponding to a desc.smallstep (resp. largestep) in internal scale, and is computed by incrementing from desc.lower. But ac->internal_to_interface(desc.lower) isn't necessarily zero. In fact it currently is 0.5 / (M - m + 1) for integer parameters where M is the maximum and m is the minimum possible value since it is the center of the [0,1/(M-m+1)] interval. Since the lower bound of the delta isn't always zero, don't ignore it when computing the actual increment.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html