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 Forum index » DIY Hardware and Software
Clean Performance Envelope Generator PCB + Panel released
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Ricko



Joined: Dec 25, 2007
Posts: 236
Location: Sydney, Australia
Audio files: 27

PostPosted: Sat Jun 15, 2019 9:15 pm    Post subject: Clean Performance Envelope Generator PCB + Panel released Reply with quote  Mark this post and the followings unread

My second PCB/panel, called the Clean envelope generator, is available now on my fricko.blog.home.

It is tidied-up and expanded version of the circuit I put up in this forum in post "New blown/tongued envelope gen circuit (sax/clar/violn)" ( http://electro-music.com/forum/topic-70340.html ) a couple of months ago.

The intent is to allow clean melodic/bass/etc lines to be played, where each note is distinct but not completely separate: this is called portato or articulated legato in classical music. That is the standard technique for reed instruments, and well-known to violinists, not not something directly available to either keyboardists or people using conventional ADSR envelopes which either smudge notes played close (i.e. legato) or have a sharp separation (i.e. stacatto). Indeed, most keyboardists (and therefore most envelope generator designers, and therefore most envelope generator customers) do no know portato even as a thing, which is why it has never been offered before (perhaps with the exception of resetting EGs, which go too far.)

Wendy Carlos addressed this issue by having two envelope generators in series, one for phrase level dynamics, and the other for note dynamics. This is the scheme that Clean uses, though with slew limiters so that the module can be used for different kinds of envelope following (no flip flop or monostable, no triggering). A lot of the functionality comes from the velocity sensitivity, and that the envelope signal is shifted at various points in the circuit by a fraction of the gate, to clip any long tails and to give an initial which moves the note "forward".

The result is an very playable AR-ish envelope generator, with a swell at the beginning of the phrase, good separation between close notes, velocity providing swell dynamics, but no long tails. You would not use if for plucked envelopes, but for notes that are organized into phrases.

Readers interested in the technical details including info on portato articulation may like to read the "backstory" page on that site.

Edit by Blue Hell : made link clickable.
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