On 12/14/21 11:02 PM, Gerhard Zintel wrote: > Now I have the following questions: > > Does anyone of you know if the original swell pedal of the B3 is > changing the volume in a linear or logarithmic way? Neither, and it is complicated. Since the gain is applied before the pre-amp, many refurbished B3s use a lamp and photo-cell/resistor to reduce hum, so any mapping is possible there. But as far as I know, the original B3 uses a variable capacity to control volume, which is linearly interpolating between 2 levels. The pedal is connected mechanically via a rod, which connects to an arm in the expression control. This adds some ratio. So while the electrical control is linear, the overall throw is not. Also as opposed to setBfree, many B3 pedals do not allow to go fully silent, either. > Maybe if the original B3 uses a linear characteristic we should not > change setBfree's code. There is also the problem that this would change existing projects that use setBfree as plugin. Changing the expression pedal mapping will make those sound different, so this is not an option. -- robin
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