On Wed, 15 Dec 2021 02:06:19 +0100 Robin Gareus <robin@xxxxxxxxxx> wrote: >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. <snip> Exactly! That was very common with a lot of 'portable' electronic organs of the 1960s too, and a bit of a nightmare. There was quite a wide range in photocell responses, along with changing output from the bulb depending on age and supply stability. -- Will J Godfrey https://willgodfrey.bandcamp.com/ http://yoshimi.github.io Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
