I have just added logscale mappings
The mappings you added are obviously useful, especially for milliseconds (x^3) mappings, but these are not logscale. A true logscale mapping plots as line if you set logscale y in gnuplot. A true logscale mapping is fully determined by two points, a center is not necessary. Here is how that would compare to the function you implemented:
begin=32.7; end=8372; center=523; e=log((end-begin) / (center-begin)) / log(2)
print e; set logscale y; plot [0:1] begin + x**e * (end-begin), center, exp (log (begin) + x * (log (end) - log (begin)))
You can also see that this is not true logscale in BlepSynth frequency knob. It has more pixels for 20..40 Hz than it has for 12000..24000 Hz, even though what we wanted is that each octave takes the same number of pixels.
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