[LAD] Half-OT: Fader mapping - was - Ardour MIDI tracer

Clemens Ladisch clemens at ladisch.de
Thu Aug 21 17:01:21 UTC 2014

Len Ovens wrote:
> On Thu, 21 Aug 2014, John Rigg wrote:
>> ... faders with a roughly logarithmic taper (no VCAs).
> Which log? I would think .5 db for the same amount of movement the
> entire fader length would be logarithmic (log 10).

For a fader from -INF to zero, alsamixer uses dB = 6000 * log10(pos),
where pos is 0...1:


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