Sorry to repost about this, but there is something I'm not getting.

In Csound and SuperCollider (as in any VST instrument, etc.), there are standard, built-in mechanisms for MIDI-activated envelopes -- meaning playing synths from a keyboard.
In Csound, it's the 'r' family of line and envelope opcodes. In SuperCollider, it's the 'gate' parameter of the EnvGen UGen.
What these do is:

• start the envelope when you press a keyboard key,
• keep the sustain level as long as you hold the key,
• engage the release segment of the envelope when you release the key (ie Note Off MIDI message).

When I posted about this ealier, someone kindly pointed me to the [c_adsr] object in RjLib. But RjLib is part of neither Pd vanilla nor Pd extended.

Leading me to ask:

1. Is playing synths from a keyboard something that Pd people just do not do? Those who need this use Csound or SC?

2. Or do all Pd users immediately install the RjLib after installing Pd, and use RjLib all the time?

3. Or does Pd have another mechanism for MIDI-driven envelopes that I'm unaware of and that everybody uses?

Thanks very much.
I'd be very curious to know if other Pd users have asked themselves the same question.

@Samuel said:

1. Is playing synths from a keyboard something that Pd people just do not do? Those who need this use Csound or SC?

People do it all the time. I don't think the developers use MIDI so much, though, but I got a similar impression about the Csound developers as well.

2. Or do all Pd users immediately install the RjLib after installing Pd, and use RjLib all the time?

No, Pd users just make their own envelopes. An ADSR envelope isn't too difficult to build with the vanilla objects, and Miller doesn't seem too into the idea of piling on "unnecessary" objects if you can already build them as abstractions. He even provides an example in 3.audio.examples -> D02.adsr.pd.

RjLib, as it happens, is entirely abstractions built from vanilla objects.