A VCO with a built-in Attack/Release envelope that you can use, or use your standard enveloping.
Quick build.  Does not have the presets I expected, just one, but it’s programmable.
OK sound (not quite to my taste) and reasonably small.
 
	A VCO with a built-in Attack/Release envelope that you can use, or use your standard enveloping.
Quick build.  Does not have the presets I expected, just one, but it’s programmable.
OK sound (not quite to my taste) and reasonably small.