[sdiy] questions on string synthesizers

[Werner Flügel]

Am 19.02.2017 um 22:31 schrieb Elain Klopke:
> How do the selectors for the various sounds work? Like with the violin and 
> cello, trumpet and tuba tabs or stops, you press the button and you hear an 
> aproximation of a violin sound, and you can add in the rest of the sounds to get 
> something orchestral. How is the string synth taking the raw output from the top 
> octive chip and subsequent dividers and transforming it into the various 
> instrument sounds? I assume there's some sort of filtering going on, but I can't 
> quite wrap my head around it.

Simple (mostly passive) filtering. You can find an example here:

http://manuals.fdiskc.com/tree/ARP/ARP%20Solina%20Schematics.pdf

Important too is the envelope of the sound, achieved by a simple VCA per
key (Logan String Melody: 1 transistor, 2 diodes, some resistors).
Interesting thread on EM-Forum:

http://electro-music.com/forum/viewtopic.php?t=33190


-- 
mfG.

W.Flügel
BTU Cottbus-Senftenberg
Nutzerdienste der IT-Services Senftenberg
Tel. 03573 / 85382

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