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Issue for ampeg_release_oncc133🔗

kinwie edited this page on 13 Jun 2020 · 11 revisions

This is an example of a more "sophisticated-yet-simplified" envelope setting, reflect from the Inital version of Maestro Grand Piano sfz that I put at : https://github.com/sfzinstruments/MatsHelgesson.MaestroConcertGrandPiano Which was later changed to conventional setting because of an issue raised by the use of CC133 for ampeg_release when involving sustain pedal.

That setting preserved in a test file "Ampeg_oncc133 test.sfz" for documentation purpose. The test file consist of 2 examples in keyswitch for comparison. Here's are the explanation for the extended CC usage for amplitude envelope and the problem scenario.

The hold and decay are using CC133, like these :

ampeg_hold=0.5
ampeg_hold_oncc133=-0.5
ampeg_decay=20
ampeg_decay_oncc133=-20

Where the hold and decay time will decreased from lower key to higher key, longer to shorter.

  • CC133 is the extended CC for keyboard note number.
  • In the 1st keyswitch example : Dampened high-notes, the release also use CC133 :
ampeg_release=2
ampeg_release_oncc133=-2

This scenario didn't have too much noticed issue with the sustain pedal use.

  • In the 2nd keyswitch example : Undampened high-notes, which is typical for piano release setting, like this :
ampeg_release_oncc131=0.4
ampeg_release_oncc133=5
ampeg_release_curvecc133=7

With the custom curve :

curve_index=7
v021=0.4
v036=0.08
v084=0.08
v090=0.4
v091=1
v108=1

Using CC131 (note-on velocity) is for making the release time increase from lovel to hivel, 0 to +0.4 seconds. For CC133 with value at 5 seconds, it utilize the use of custom curve definition to shape the release time across key-range.

  • At key 21, will have release time 2 seconds and decrease to key 36
  • At key 36 to 84, release time 0.4 seconds
  • At key 90, release time 2 seconds, increased from key 84
  • At key 91 to 108, release time 5 seconds

At the moment, this kind of setting will have issue when using the sustain pedal. The issue was found by @jlearman, with action sequence as :

  • Hold sustain pedal down
  • Press low note (e.g. 60/C) and release
  • Press Undampened high-note (e.g. 91/G) and release
  • Release sustain pedal

The low note C continues to ring, which is supposed off.

So, this documentation posted for future reminder if similar case occurred using CC133.