[sdiy] MIDI volume to volts formula

[John Speth]

I have been having a difficult time finding a workable formula for converting the MIDI velocity value (the third byte in a note on/off message) to a Vpp value.  Does anybody know the mathematical formula for this conversion?  Something like Vpp = func(velocity).  Let's assume Vpp(max, when velocity is 127) is 1.0V.

The reason I need to know is I have device that I can control frequency in terms of Hz and velocity in terms of Vpp.  I'm not sure if I need a function based on log10() or antilog10().

Thanks and sorry for the dopey question.

JJS

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